Massa filter adapter for Cokin system, 77mm lens thread (SB620)

The Massa filter adapter for Cokin system, 77mm lens thread (SB620) allows mounting a 77mm threaded lens to Cokin-style square filter holders. It creates a stable mechanical connection between lenses that have a 77mm external filter thread and standard Cokin filter holders, enabling use of rectangular, graduated and polarizing accessories designed for the Cokin system. The adapter is a simple mounting ring that sits on the lens thread and provides the required interface for the filter holder without altering optical characteristics of the lens.

Advantages

This adapter supports straightforward integration of 77mm lenses into the Cokin filter ecosystem, expanding creative control for landscape, architectural and long-exposure photography. It is lightweight and compact, designed to keep the optical axis unobstructed and to minimise vignetting when used within recommended focal length ranges. The mechanical fit is intended for lenses with an external 77mm thread and offers a reliable, repeatable mount for sliding square filters.

Suitable for

• Landscape photography with graduated neutral density filters
• Architectural shots requiring controlled highlights and reflections
• Long-exposure photography using neutral density filters
• Situations where rectangular or polarizing filter holders are preferred over screw-in filters

Key specifications

• Lens thread compatibility: 77 mm external filter thread
• Interface: Cokin-style square filter holder mount
• Material: metal or reinforced plastic construction for stable fit (manufacturer specification)
• Design: low-profile ring to reduce vignetting on standard wide-to-tele focal lengths
• Weight: compact and lightweight for minimal added load on the lens

How to use

Screw the adapter onto the lens 77mm filter thread until it seats securely without forcing. Attach the Cokin filter holder by sliding or clipping it onto the adapter according to the holder design, ensuring the holder is aligned with the lens optical axis. Insert the desired rectangular or graduated filters into the holder and adjust their vertical position as needed for composition. Remove the adapter by unscrewing it counterclockwise when no longer required.

Usage recommendations

Check the lens front element and the adapter fit before use to avoid cross-threading. When shooting at very wide focal lengths, test for vignetting and, if necessary, use a thinner holder or step-down accessories. Store the adapter in a protective pouch to prevent scratches and keep threads clean for reliable mounting.