Massa lens adapter ring from 39mm to 42mm, model SB3602

The Massa lens adapter ring from 39mm to 42mm, model SB3602, is a compact metal reduction/adapter designed to convert a 39mm male or female thread to a 42mm thread (39→42). It enables mounting of 42mm filters, step-up/step-down accessories or small lens attachments onto optics with a 39mm thread without modifying the original lens. The adapter preserves thread alignment and provides a simple mechanical interface for combining existing filters and accessories across these two common filter sizes.

Advantages

This metal adapter offers a lightweight and durable solution for matching 39mm lens threads to 42mm accessories. Its compact profile minimizes added bulk at the front of the lens while maintaining secure threaded connections. The adapter removes the need to purchase duplicate filters or swap multiple rings, improving workflow efficiency for photographers who use multiple lenses and want accessory compatibility between 39mm and 42mm items.

Suitable for

• Mounting 42mm screw-on filters on lenses with a 39mm thread
• Attaching small 42mm accessories such as close-up lenses or converters to 39mm optics
• Adapting existing 42mm filters or caps for use with older or compact lenses that have 39mm threads

Key specifications

• Material: metal construction for durability and thread stability
• Thread conversion: 39mm to 42mm (39→42)
• Finish: matte or plated metal surface to reduce reflections
• Form factor: low-profile ring that adds minimal extension to the lens front
• Compatibility: designed for standard 39mm and 42mm screw-type filter threads

How to use

Screw the Massa adapter gently onto the 39mm thread of the lens until it seats securely without forcing. Then screw the 42mm accessory or filter onto the outer 42mm thread of the adapter in the same manner. Ensure threads are clean and free of grit before assembly to avoid cross-threading. When removing, reverse the process by unscrewing the accessory and then the adapter. The adapter can remain on the lens if regular use of 42mm accessories is required.

Usage recommendations

The adapter is intended for mechanical thread conversion only and does not provide optical correction. Check for compatibility of filter thickness and accessory clearance to avoid vignetting on wide-angle lenses. Store the adapter in a small protective pouch when not in use to prevent scratches and keep threads clean.