{"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","url":"https:\/\/www.hejnarphotostore.com\/products\/hejnar-manfrotto-501-503-extra-long-arca-swiss-con","provider":"Hejnar Photo","version":"1.0","type":"link"}