{"title":"Manfrotto 501PL\/501PLong Plate replacement","description":null,"products":[{"product_id":"hejnar-manfrotto-501-503-arca-swiss-conversion-ada","title":"Arca-Swiss Conversion Adapter Set for Manfrotto 501 and 503 Pro Video Heads","description":"\u003c!-- ===================== GRAY HEADER BANNER ===================== --\u003e \n\u003cdiv style=\"background:#f8f9fa; border-left:4px solid #1a1a1a; padding:15px; margin-bottom:25px; font-family:Arial, sans-serif;\"\u003e \n    \u003cstrong style=\"font-size:18px; color:#1a1a1a;\"\u003eHejnar Photo – M577-350 Manfrotto 501\/503 to Arca-Swiss Adapter Set\u003c\/strong\u003e \n\u003c\/div\u003e \n\n\u003c!-- ===================== H1 SEO HEADLINE ===================== --\u003e \n\u003ch1 style=\"font-family:Arial, sans-serif; font-size:24px; color:#111; margin-bottom:20px; line-height:1.3; font-weight:700;\"\u003e\n    Arca-Swiss Conversion Adapter Set for Manfrotto 501 and 503 Pro Video Heads\n\u003c\/h1\u003e \n\n\u003c!-- ===================== INTRODUCTORY OVERVIEW ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; line-height:1.6; color:#333; margin-bottom:25px;\"\u003e \n    \u003cp style=\"font-size:15px;\"\u003e \n        The \u003cstrong\u003eHejnar Photo M577-350 Adapter Set\u003c\/strong\u003e is a precision-engineered solution designed to bring universal Arca-Swiss compatibility to your Manfrotto video support system. Specifically engineered for heads utilizing the \u003cstrong\u003e3433PL (501PL)\u003c\/strong\u003e mounting plate system—including the 501, 503, 3433, 3460, and 3465—this comprehensive kit provides a rock-solid, modular bridge between professional video heads and photography gear. Proudly CNC-machined in the USA from solid 6061-T6 aluminum, it allows you to utilize Arca-style plates, L-brackets, and accessories without compromising the smooth fluid movement of your Manfrotto head.\n    \u003c\/p\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== SAE TECHNICAL SPECIFICATIONS ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eSAE Technical Specifications\u003c\/h2\u003e \n    \u003cdiv style=\"display: flex; gap: 20px; flex-wrap: wrap;\"\u003e\n        \u003cdiv style=\"flex: 1; min-width: 280px;\"\u003e\n            \u003ch3 style=\"font-size:16px; margin-bottom:10px;\"\u003eAdapter Plate Specs\u003c\/h3\u003e\n            \u003cul style=\"padding-left:20px; line-height:1.6; font-size:14px; color:#333;\"\u003e \n                \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Manfrotto 501, 503, 3433, 3460, 3465, and 577 systems.\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 3.50 inches (89 mm).\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.2 oz (120g).\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Two sets of outside holes tapped 10-32, spaced 30mm and 45mm apart.\u003c\/li\u003e\n                \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e CNC-machined solid 6061-T6 Aluminum.\u003c\/li\u003e\n            \u003c\/ul\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex: 1; min-width: 280px;\"\u003e\n            \u003ch3 style=\"font-size:16px; margin-bottom:10px;\"\u003eF63b Clamp Specs\u003c\/h3\u003e\n            \u003cul style=\"padding-left:20px; line-height:1.6; font-size:14px; color:#333;\"\u003e \n                \u003cli\u003e\n\u003cstrong\u003eJaw Length:\u003c\/strong\u003e 3.25 inches (82.5 mm).\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.7 oz (135g).\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eSafety Features:\u003c\/strong\u003e Integrated relief grooves prevent gear from sliding out if the clamp is not fully closed.\u003c\/li\u003e\n                \u003cli\u003e\n\u003cstrong\u003eKnob Design:\u003c\/strong\u003e Captive, one-piece design that is dust and sand resistant.\u003c\/li\u003e\n            \u003c\/ul\u003e\n        \u003c\/div\u003e\n    \u003c\/div\u003e\n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== INSTALLATION STEPS ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eDetailed Installation Instructions\u003c\/h2\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:12px; color:#333;\"\u003e \n        Modernize your video head in just a few simple steps using the included hardware: \n    \u003c\/p\u003e \n    \u003col style=\"padding-left:20px; line-height:1.8; font-size:14px; color:#333;\"\u003e \n        \u003cli\u003e\n\u003cstrong\u003eSecure the Adapter Plate:\u003c\/strong\u003e Slide the Hejnar adapter plate into your Manfrotto head just as you would a standard 501PL plate.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eMount the Arca-Swiss Clamp:\u003c\/strong\u003e Use the included alignment pins to set your preferred orientation (parallel or perpendicular) and secure the F63b clamp to the plate.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eLock Rotation:\u003c\/strong\u003e Tighten the clamp to the plate; the integrated pins and secondary alignment holes prevent any accidental rotation under heavy camera loads.\u003c\/li\u003e \n    \u003c\/ol\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== KEY FEATURES SECTION ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eQuick Overview \u0026amp; Key Features\u003c\/h2\u003e \n    \u003cul style=\"padding-left:20px; line-height:1.8; font-size:14px; color:#333;\"\u003e \n        \u003cli\u003e\n\u003cstrong\u003eComplete Modular System:\u003c\/strong\u003e The Arca-style clamp can be detached from the plate and used independently on other equipment like rails or monopods.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eRotational Ergonomics:\u003c\/strong\u003e Included alignment pins allow the clamp to be mounted in multiple orientations to clear cables or suit your specific shooting style.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eField Reliability:\u003c\/strong\u003e The captive knob design stops at its maximum opening, ensuring it cannot be lost in the field.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003ePrecision Build:\u003c\/strong\u003e Hard-coat black anodized finish on the plate and clamp provides superior resistance to abrasion and corrosion.\u003c\/li\u003e \n    \u003c\/ul\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== PRODUCT DESCRIPTION ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; line-height:1.6; color:#333;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eComprehensive Product Description\u003c\/h2\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:15px;\"\u003e \n        The \u003cstrong\u003eHejnar Photo M577-350 Manfrotto to Arca-Swiss Adapter Set\u003c\/strong\u003e is the definitive upgrade for professionals who demand the smooth, fluid control of a video head combined with the modular security of the Arca-Swiss ecosystem. By converting your 501, 503, or 577 series head, you bypass the inherent limitations of proprietary sliding plates, ensuring your micron-level gear adjustments translate perfectly to your final capture.\n    \u003c\/p\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:15px;\"\u003e \n        Machined from a solid block of aircraft-grade \u003cstrong\u003e6061-T6 aluminum\u003c\/strong\u003e, the structural integrity of this system ensures zero flex, even when supporting heavy professional video payloads. The F63b clamp features a sophisticated \"tongue-in-pocket\" design that protects its internal threaded stud from dust and grit, while keeping the jaws perfectly aligned with your plate's geometry. Integrated safety stop relief grooves provide an essential fail-safe, preventing your gear from free-falling if the clamp is accidentally loosened.\n    \u003c\/p\u003e \n    \u003cp style=\"font-size:14px;\"\u003e \n        Proudly made in the USA, this component embodies the technical excellence and rigorous tolerances that distinguish Hejnar Photo from mass-produced alternatives. It is an intelligent, high-value investment that modernizes your existing support architecture for ultimate reliability across all your tripod and monopod rigs.\n    \u003c\/p\u003e \n\u003c\/div\u003e","brand":"Hejnar Photo","offers":[{"title":"Default Title","offer_id":67701611626601,"sku":"M577-350F63b","price":110.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/1278\/9353\/files\/M577-350F63b-2.jpg?v=1792111433"},{"product_id":"hejnar-manfrotto-501-503-extended-arca-swiss-conve","title":"Extended Arca-Swiss Conversion Set for Manfrotto 501, 503, and 577 Video Heads | 5.50\" Plate","description":"\u003c!-- ===================== GRAY HEADER BANNER ===================== --\u003e\n\u003cdiv style=\"background: #f8f9fa; border-left: 4px solid #1a1a1a; padding: 15px; margin-bottom: 25px; font-family: Arial, sans-serif;\"\u003e\u003cstrong style=\"font-size: 18px; color: #1a1a1a;\"\u003e5.50-inchHejnar Photo – M577-550 Manfrotto 501\/503 Extended Arca-Swiss Conversion Set\u003c\/strong\u003e\u003c\/div\u003e\n\u003c!-- ===================== H1 SEO HEADLINE ===================== --\u003e\n\u003ch1 style=\"font-family: Arial, sans-serif; font-size: 24px; color: #111; margin-bottom: 20px; line-height: 1.3; font-weight: bold;\"\u003eExtended Arca-Swiss Conversion Set for Manfrotto 501, 503, and 577 Video Heads | 5.50\" Plate\u003c\/h1\u003e\n\u003c!-- ===================== INTRODUCTORY OVERVIEW ===================== --\u003e\n\u003cdiv style=\"font-family: Arial, sans-serif; line-height: 1.6; color: #333; margin-bottom: 25px;\"\u003e\n\u003cp style=\"font-size: 15px;\"\u003eThe \u003cstrong\u003eHejnar Photo M577-550 Conversion Set\u003c\/strong\u003e is a precision solution designed to modernize high-performance video heads with universal Arca-Swiss compatibility. Specifically engineered for Manfrotto systems utilizing the \u003cstrong\u003e3433PL (501PL)\u003c\/strong\u003e mounting plate—including the 501, 503, 3433, 3460, and 3465—this set features an extended 5.50-inch plate for superior balancing of larger professional rigs. CNC-machined in the USA from solid 6061-T6 aluminum, it provides a monolithic foundation for photographers and videographers transitioning between specialized mounting systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr style=\"border: 0; border-top: 1px solid #eee; margin: 25px 0;\"\u003e\u003c!-- ===================== SAE TECHNICAL SPECIFICATIONS ===================== --\u003e\n\u003cdiv style=\"font-family: Arial, sans-serif; margin-bottom: 25px;\"\u003e\n\u003ch2 style=\"font-size: 20px; color: #111; margin-bottom: 15px; border-bottom: 2px solid #1a1a1a; padding-bottom: 5px; font-weight: 600;\"\u003eSAE Technical Specifications\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; gap: 20px; flex-wrap: wrap;\"\u003e\n\u003cdiv style=\"flex: 1; min-width: 280px;\"\u003e\n\u003ch3 style=\"font-size: 16px; margin-bottom: 10px;\"\u003eAdapter Plate Specs\u003c\/h3\u003e\n\u003cul style=\"padding-left: 20px; line-height: 1.6; font-size: 14px; color: #333;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Manfrotto 501, 503, 577, 3433, 3460, 3465, and Sachtler DV-1\/FSB series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 5.50 inches (140 mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5.6 oz (167g).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Two sets of outside holes tapped 10-32 (30mm and 45mm spacing).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 6061-T6 Aircraft-Grade Aluminum.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 280px;\"\u003e\n\u003ch3 style=\"font-size: 16px; margin-bottom: 10px;\"\u003eQuick Release Clamp Specs\u003c\/h3\u003e\n\u003cul style=\"padding-left: 20px; line-height: 1.6; font-size: 14px; color: #333;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eJaw Length:\u003c\/strong\u003e 3.25 inches (82.5 mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware:\u003c\/strong\u003e High-strength stainless steel components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety stop:\u003c\/strong\u003e Dual relief grooves prevent gear from free-falling if the clamp is loosened.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnob Design:\u003c\/strong\u003e Captive, dust-resistant one-piece design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr style=\"border: 0; border-top: 1px solid #eee; margin: 25px 0;\"\u003e\u003c!-- ===================== INSTALLATION STEPS ===================== --\u003e\n\u003cdiv style=\"font-family: Arial, sans-serif; margin-bottom: 25px;\"\u003e\n\u003ch2 style=\"font-size: 20px; color: #111; margin-bottom: 15px; border-bottom: 2px solid #1a1a1a; padding-bottom: 5px; font-weight: 600;\"\u003eDetailed Installation Instructions\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 12px; color: #333;\"\u003eUpgrade your video system in just a few simple steps using the included hardware:\u003c\/p\u003e\n\u003col style=\"padding-left: 20px; line-height: 1.8; font-size: 14px; color: #333;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure the Adapter Plate:\u003c\/strong\u003e Slide the Hejnar adapter plate into your Manfrotto head just like a standard 501PL plate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition the Clamp:\u003c\/strong\u003e Utilize the provided alignment pins to set your preferred orientation (parallel or perpendicular) on the 5.5\" plate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal Assembly:\u003c\/strong\u003e Tighten the clamp to the plate; the precision pins prevent any accidental rotation under heavy camera loads.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003chr style=\"border: 0; border-top: 1px solid #eee; margin: 25px 0;\"\u003e\u003c!-- ===================== KEY FEATURES SECTION ===================== --\u003e\n\u003cdiv style=\"font-family: Arial, sans-serif; margin-bottom: 25px;\"\u003e\n\u003ch2 style=\"font-size: 20px; color: #111; margin-bottom: 15px; border-bottom: 2px solid #1a1a1a; padding-bottom: 5px; font-weight: 600;\"\u003eQuick Overview \u0026amp; Key Features\u003c\/h2\u003e\n\u003cul style=\"padding-left: 20px; line-height: 1.8; font-size: 14px; color: #333;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Balancing Range:\u003c\/strong\u003e The 5.5\" plate offers significantly more travel for balancing front-heavy long lenses or telephoto setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModular Versatility:\u003c\/strong\u003e The 3.25\" Arca-style clamp can be detached and used independently on other equipment if needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOmnidirectional Orientation:\u003c\/strong\u003e Alignment pins allow you to mount the clamp in multiple directions to clear cables or suit your workflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional Grade:\u003c\/strong\u003e Black hard-coat anodized finish provides superior resistance to abrasion, while the captive knob prevents field loss.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003chr style=\"border: 0; border-top: 1px solid #eee; margin: 25px 0;\"\u003e\u003c!-- ===================== PRODUCT DESCRIPTION ===================== --\u003e\n\u003cdiv style=\"font-family: Arial, sans-serif; line-height: 1.6; color: #333;\"\u003e\n\u003ch2 style=\"font-size: 20px; color: #111; margin-bottom: 15px; border-bottom: 2px solid #1a1a1a; padding-bottom: 5px; font-weight: 600;\"\u003eComprehensive Product Description\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 15px;\"\u003eThe \u003cstrong\u003eHejnar Photo M577-550 Extended Arca-Swiss Conversion Set\u003c\/strong\u003e is the ultimate solution for professional videographers seeking the modular stability of the Arca-Swiss ecosystem combined with the fluid control of Manfrotto video heads. By converting your 501, 503, or 577 series head, you eliminate the \"play\" often found in stock sliding plates, ensuring your micron-level gear adjustments translate perfectly to your final capture.\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; margin-bottom: 15px;\"\u003eThe heart of this kit is the extended 5.50-inch adapter plate, which provides a significantly larger surface area than standard plates. This additional length is critical for balancing heavy professional payloads, such as high-end mirrorless setups or cinema cameras with long lenses. The integrated safety stop relief grooves provide a vital fail-safe, stopping an Arca-type plate from sliding out if the clamp is accidentally loosened.\u003c\/p\u003e\n\u003cp style=\"font-size: 14px;\"\u003eProudly made in the USA, this component provides the structural integrity and technical excellence that defines Hejnar Photo gear, making it a superior alternative to mass-produced adapters from competitors like \u003cstrong\u003eReally Right Stuff\u003c\/strong\u003e or \u003cstrong\u003eKirk\u003c\/strong\u003e. It is a robust, intelligent investment that modernizes your existing support architecture for ultimate reliability across all your tripod and monopod rigs.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Hejnar Photo","offers":[{"title":"Default Title","offer_id":67701611659369,"sku":"M577-550F63b","price":110.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/1278\/9353\/files\/M577-550F63b-5_8c6d8fbf-2c35-425d-890e-76e468257c68.jpg?v=1793926052"},{"product_id":"hejnar-manfrotto-501-503-extra-long-arca-swiss-con","title":"Arca-Swiss Conversion Set for Manfrotto 501 and 503 Pro Video Heads | 8.75\" Extra-Long Plate","description":"\u003c!-- ===================== GRAY HEADER BANNER ===================== --\u003e \n\u003cdiv style=\"background:#f8f9fa; border-left:4px solid #1a1a1a; padding:15px; margin-bottom:25px; font-family:Arial, sans-serif;\"\u003e \n    \u003cstrong style=\"font-size:18px; color:#1a1a1a;\"\u003eHejnar Photo – M577-875 Manfrotto 501\/503 Extra-Long Arca-Swiss Conversion Set\u003c\/strong\u003e \n\u003c\/div\u003e \n\n\u003c!-- ===================== H1 SEO HEADLINE ===================== --\u003e \n\u003ch1 style=\"font-family:Arial, sans-serif; font-size:24px; color:#111; margin-bottom:20px; line-height:1.3; font-weight:700;\"\u003e\n    Arca-Swiss Conversion Set for Manfrotto 501 and 503 Pro Video Heads | 8.75\" Extra-Long Plate\n\u003c\/h1\u003e \n\n\u003c!-- ===================== INTRODUCTORY OVERVIEW ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; line-height:1.6; color:#333; margin-bottom:25px;\"\u003e \n    \u003cp style=\"font-size:15px;\"\u003e \n        The \u003cstrong\u003eHejnar Photo M577-875 Conversion Set\u003c\/strong\u003e is a precision-engineered solution designed to modernize high-performance video heads with universal Arca-Swiss compatibility. Specifically engineered for Manfrotto systems utilizing the \u003cstrong\u003e3433PL (501PL)\u003c\/strong\u003e mounting plate—including the 501, 503, 3433, 3460, and 3465—this set features an extra-long 8.75-inch plate for maximum balancing range. This high-quality interface facilitates precise positioning and stability when switching between heavy cinema and telephoto rigs.\n    \u003c\/p\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== SAE TECHNICAL SPECIFICATIONS ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eSAE Technical Specifications\u003c\/h2\u003e \n    \u003cdiv style=\"display: flex; gap: 20px; flex-wrap: wrap;\"\u003e\n        \u003cdiv style=\"flex: 1; min-width: 280px;\"\u003e\n            \u003ch3 style=\"font-size:16px; margin-bottom:10px;\"\u003eAdapter Plate Specs\u003c\/h3\u003e\n            \u003cul style=\"padding-left:20px; line-height:1.6; font-size:14px; color:#333;\"\u003e \n                \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Manfrotto 501, 503, 577, 3433, 3460, and 3465 systems.\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 8.75 inches (222 mm).\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e CNC-machined from solid 6061-T6 Aircraft-Grade Aluminum.\u003c\/li\u003e\n                \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Durable black hard-coat anodized surface.\u003c\/li\u003e\n            \u003c\/ul\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex: 1; min-width: 280px;\"\u003e\n            \u003ch3 style=\"font-size:16px; margin-bottom:10px;\"\u003eQuick Release Clamp Specs\u003c\/h3\u003e\n            \u003cul style=\"padding-left:20px; line-height:1.6; font-size:14px; color:#333;\"\u003e \n                \u003cli\u003e\n\u003cstrong\u003eJaw Length:\u003c\/strong\u003e 3.25 inches (82.5 mm).\u003c\/li\u003e \n                \u003cli\u003e\n\u003cstrong\u003eSafety stop:\u003c\/strong\u003e 2.6mm deep relief grooves prevent gear from free-falling if the clamp is loosened.\u003c\/li\u003e\n                \u003cli\u003e\n\u003cstrong\u003eKnob Design:\u003c\/strong\u003e Captive, one-piece design; stops at maximum opening and cannot be lost in the field.\u003c\/li\u003e\n                \u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e Tongue-in-pocket design protects internal parts from dust and grit.\u003c\/li\u003e\n            \u003c\/ul\u003e\n        \u003c\/div\u003e\n    \u003c\/div\u003e\n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== INSTALLATION STEPS ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eDetailed Installation Instructions\u003c\/h2\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:12px; color:#333;\"\u003e \n        Modernize your video head in just a few simple steps using the included hardware: \n    \u003c\/p\u003e \n    \u003col style=\"padding-left:20px; line-height:1.8; font-size:14px; color:#333;\"\u003e \n        \u003cli\u003e\n\u003cstrong\u003eSecure the Adapter Plate:\u003c\/strong\u003e Slide the Hejnar 8.75\" adapter plate into your Manfrotto head just like a standard 501PL plate.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003ePosition the Clamp:\u003c\/strong\u003e Utilize the provided alignment pins to set your preferred orientation (parallel or perpendicular) on the extra-long plate.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eFinal Assembly:\u003c\/strong\u003e Tighten the clamp to the plate; the precision pins and stainless steel hardware prevent any accidental rotation under heavy camera loads.\u003c\/li\u003e \n    \u003c\/ol\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== KEY FEATURES SECTION ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eQuick Overview \u0026amp; Key Features\u003c\/h2\u003e \n    \u003cul style=\"padding-left:20px; line-height:1.8; font-size:14px; color:#333;\"\u003e \n        \u003cli\u003e\n\u003cstrong\u003eMaximum Balancing Travel:\u003c\/strong\u003e The 8.75\" plate provides significantly more travel than standard plates, essential for balancing front-heavy cinema rigs.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eModular Versatility:\u003c\/strong\u003e The 3.25\" Arca-style clamp can be detached and used independently on other equipment.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003ePrecision Build:\u003c\/strong\u003e CNC-machined from 6061-T6 aluminum with rounded corners and edges for safety and gear protection.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eZero Rotational Play:\u003c\/strong\u003e Milled registration ensures the clamp remains perfectly aligned with the head's axis even under extreme payloads.\u003c\/li\u003e \n    \u003c\/ul\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== PRODUCT DESCRIPTION ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; line-height:1.6; color:#333;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eComprehensive Product Description\u003c\/h2\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:15px;\"\u003e \n        The \u003cstrong\u003eHejnar Photo M577-875 Extra-Long Arca-Swiss Conversion Set\u003c\/strong\u003e is the ultimate solution for professional videographers seeking the modular stability of the Arca-Swiss ecosystem combined with the fluid control of Manfrotto video heads. By converting your 501, 503, or 577 series head, you eliminate the \"play\" often found in stock sliding plates, ensuring your micron-level gear adjustments translate perfectly to your final capture.\n    \u003c\/p\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:15px;\"\u003e \n        The heart of this kit is the extra-long 8.75-inch adapter plate, which provides a massive surface area for balancing heavy professional payloads, such as cinema cameras with large matte boxes or long telephoto lenses. The integrated safety stop relief grooves provide a vital fail-safe, stopping an Arca-type plate from sliding out if the clamp is accidentally loosened. \n    \u003c\/p\u003e \n    \u003cp style=\"font-size:14px;\"\u003e \n        Proudly made in the USA, this component provides the structural integrity and technical excellence that defines Hejnar Photo gear, making it a superior alternative to mass-produced adapters from competitors like \u003cstrong\u003eReally Right Stuff\u003c\/strong\u003e or \u003cstrong\u003eKirk\u003c\/strong\u003e. It is a robust, intelligent investment that modernizes your existing support architecture for ultimate reliability across all your tripod and monopod rigs.\n    \u003c\/p\u003e \n\u003c\/div\u003e","brand":"Hejnar Photo","offers":[{"title":"Default Title","offer_id":67701611692137,"sku":"M577-875F63b","price":110.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/1278\/9353\/files\/M577-875F63-5.jpg?v=1793848593"},{"product_id":"hejnar-manfrotto-501pl-502-504-arca-swiss-conversi","title":"Arca-Swiss Conversion Adapter for Manfrotto 501PL, 502, 504, Nitro, RC3, RC5, and NG Heads","description":"\u003c!-- ===================== GRAY HEADER BANNER ===================== --\u003e \n\u003cdiv style=\"background:#f8f9fa; border-left:4px solid #1a1a1a; padding:15px; margin-bottom:25px; font-family:Arial, sans-serif;\"\u003e \n    \u003cstrong style=\"font-size:18px; color:#1a1a1a;\"\u003eHejnar Photo – 3.50\" Manfrotto Conversion Plate with Integrated Arca-Swiss Clamp\u003c\/strong\u003e \n\u003c\/div\u003e \n\n\u003c!-- ===================== H1 SEO HEADLINE ===================== --\u003e \n\u003ch1 style=\"font-family:Arial, sans-serif; font-size:24px; color:#111; margin-bottom:20px; line-height:1.3; font-weight:700;\"\u003e\n    Arca-Swiss Conversion Adapter for Manfrotto 501PL, 502, 504, Nitro, RC3, RC5, and NG Heads\n\u003c\/h1\u003e \n\n\u003c!-- ===================== INTRODUCTORY OVERVIEW ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; line-height:1.6; color:#333; margin-bottom:25px;\"\u003e \n    \u003cp style=\"font-size:15px;\"\u003e \n        The \u003cstrong\u003eHejnar Photo MF501 Conversion Plate\u003c\/strong\u003e is a professional-grade solution designed to bring universal Arca-Swiss compatibility to your Manfrotto video support system. This 3.50-inch adapter plate features a \u003cstrong\u003ebuilt-in Arca-type clamp\u003c\/strong\u003e, allowing you to bypass proprietary Manfrotto sliding plates and utilize your preferred Arca-style L-brackets and camera plates directly on fluid video heads. Precision CNC-machined in the USA from solid 6061-T6 aluminum, it provides an unyielding, monolithic foundation for technical videography and hybrid shooting.\n    \u003c\/p\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== SAE TECHNICAL SPECIFICATIONS ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eSAE Technical Specifications\u003c\/h2\u003e \n    \u003cul style=\"padding-left:20px; line-height:1.8; font-size:14px; color:#333;\"\u003e \n        \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for Manfrotto 501PL, 502, 504, Nitro, RC3, RC5, and 701 NG heads.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003ePlate Length:\u003c\/strong\u003e 3.50 inches (89mm) for balanced support.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eIntegrated Clamp:\u003c\/strong\u003e Features a smooth-engagement Arca-type quick-release mechanism built directly into the plate.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e CNC-machined from high-density 6061-T6 Aircraft-Grade Aluminum.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Durable black hard-coat anodized surface for superior abrasion resistance.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eManufacturing:\u003c\/strong\u003e Designed, machined, and quality-tested in the USA.\u003c\/li\u003e \n    \u003c\/ul\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== KEY FEATURES SECTION ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; margin-bottom:25px;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eQuick Overview \u0026amp; Key Features\u003c\/h2\u003e \n    \u003cul style=\"padding-left:20px; line-height:1.8; font-size:14px; color:#333;\"\u003e \n        \u003cli\u003e\n\u003cstrong\u003eDirect System Hybrid:\u003c\/strong\u003e Transitions your video rig from Manfrotto dovetails to Arca-Swiss standards without stacking multiple adapters.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Stability:\u003c\/strong\u003e Replaces factory components with a rigid aluminum bridge to minimize vibration and eliminate \"play\" during panning and tilting.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eStreamlined Workflow:\u003c\/strong\u003e Perfect for videographers using DSLRs or mirrorless cameras who want to move quickly between photography ball heads and fluid video heads.\u003c\/li\u003e \n        \u003cli\u003e\n\u003cstrong\u003eZero Rotational Play:\u003c\/strong\u003e The one-piece integrated design ensures the clamp remains perfectly aligned with the head's axis.\u003c\/li\u003e \n    \u003c\/ul\u003e \n\u003c\/div\u003e \n\n\u003chr style=\"border:0; border-top:1px solid #eee; margin:25px 0;\"\u003e \n\n\u003c!-- ===================== PRODUCT DESCRIPTION ===================== --\u003e \n\u003cdiv style=\"font-family:Arial, sans-serif; line-height:1.6; color:#333;\"\u003e \n    \u003ch2 style=\"font-size:20px; color:#111; margin-bottom:15px; border-bottom:2px solid #1a1a1a; padding-bottom:5px; font-weight:600;\"\u003eComprehensive Product Description\u003c\/h2\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:15px;\"\u003e \n        The Hejnar Photo 3.50-Inch Manfrotto Conversion Plate is the definitive upgrade for professionals who demand the smooth, fluid control of a video head combined with the universal flexibility of the Arca-Swiss ecosystem. By converting your 501PL, 502, or 504 series head, you bypass the inherent limitations of proprietary sliding plates, ensuring your framing remains perfectly aligned through every pan and tilt.\n    \u003c\/p\u003e \n    \u003cp style=\"font-size:14px; margin-bottom:15px;\"\u003e \n        This plate is meticulously engineered for the unyielding stability required for heavy professional payloads. The high-density 6061-T6 aluminum construction provides a monolithic connection that factory components simply cannot match, effectively dampening vibrations for critical captures. Because the Arca clamp is integrated directly into the plate, it maintains a low center of gravity and reduces the bulk associated with stacking third-party clamps onto your existing Manfrotto plates.\n    \u003c\/p\u003e \n    \u003cp style=\"font-size:14px;\"\u003e \n        Made in the USA, this component provides the structural integrity and technical excellence that defines Hejnar Photo gear, making it a superior alternative to mass-produced adapters from competitors. It is an intelligent, high-value investment that modernizes your existing support architecture for ultimate reliability across your entire gear bag.\n    \u003c\/p\u003e \n\u003c\/div\u003e","brand":"Hejnar Photo","offers":[{"title":"Default Title","offer_id":67701614805097,"sku":"MF501","price":70.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/1278\/9353\/files\/MF501_006.jpg?v=1793587319"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/1278\/9353\/collections\/M577-875F63b-2.jpg?v=1792719967","url":"https:\/\/www.hejnarphotostore.com\/collections\/m577-replacement.oembed","provider":"Hejnar Photo","version":"1.0","type":"link"}