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