Lens Step-Up Adapter Massa 40.5mm to 49mm (filter/thread reducer) SB3329

The Massa 40.5mm to 49mm step-up adapter (model SB3329) lets you attach 49mm screw-on filters and accessories to lenses with a 40.5mm front thread. This mechanical adapter preserves the lens thread while expanding the attachment diameter, so existing 49mm filters, caps or converters can be reused on smaller lenses without modifying the lens or filter.

Advantages

The adapter is lightweight and low-profile, providing a stable screw connection between a 40.5mm lens thread and 49mm accessories. It reduces the need to buy duplicate filters by enabling compatibility across different lenses. Its straightforward metal construction ensures consistent alignment and easy mounting and removal of filters or caps.

Suitable for

• Attaching 49mm screw-on filters (UV, ND, polarizers) to lenses with 40.5mm threads
• Using 49mm lens caps or protective covers on smaller lenses
• Connecting 49mm adapters or converters to 40.5mm lenses
• Standardizing filter sizes across a mixed lens kit

Key specifications

• Input thread diameter: 40.5mm (lens side)
• Output thread diameter: 49mm (filter/accessory side)
• Material: metal alloy construction for dimensional stability
• Finish: black matte coating to reduce stray reflections
• Type: step-up (thread enlarger) adapter
• Mounting: screw-in on both lens and accessory threads

How to use

Screw the adapter onto the lens front thread until it seats firmly but do not overtighten. After the adapter is in place, screw the 49mm filter or accessory onto the adapter’s outer thread until secure. To remove, reverse the process: unscrew the filter first, then unthread the adapter from the lens. Check thread alignment before tightening to avoid cross-threading.

Usage recommendations

For best results, use the adapter with slim-profile filters to minimize the risk of vignetting on wide-angle lenses. Regularly inspect threads for dust and grit and clean with a soft brush or cloth to maintain smooth operation.