Extended Arca-Swiss Conversion Set for Manfrotto 501, 503, and 577 Video Heads | 5.50" Plate

The Hejnar Photo M577-550 Conversion Set is a precision solution designed to modernize high-performance video heads with universal Arca-Swiss compatibility. Specifically engineered for Manfrotto systems utilizing the 3433PL (501PL) 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.

SAE Technical Specifications

Detailed Installation Instructions

Upgrade your video system in just a few simple steps using the included hardware:

1. Secure the Adapter Plate: Slide the Hejnar adapter plate into your Manfrotto head just like a standard 501PL plate.
2. Position the Clamp: Utilize the provided alignment pins to set your preferred orientation (parallel or perpendicular) on the 5.5" plate.
3. Final Assembly: Tighten the clamp to the plate; the precision pins prevent any accidental rotation under heavy camera loads.

Quick Overview & Key Features

• Extended Balancing Range: The 5.5" plate offers significantly more travel for balancing front-heavy long lenses or telephoto setups.
• Modular Versatility: The 3.25" Arca-style clamp can be detached and used independently on other equipment if needed.
• Omnidirectional Orientation: Alignment pins allow you to mount the clamp in multiple directions to clear cables or suit your workflow.
• Professional Grade: Black hard-coat anodized finish provides superior resistance to abrasion, while the captive knob prevents field loss.

Comprehensive Product Description

The Hejnar Photo M577-550 Extended Arca-Swiss Conversion Set 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.

The 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.

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 Really Right Stuff or Kirk. It is a robust, intelligent investment that modernizes your existing support architecture for ultimate reliability across all your tripod and monopod rigs.