Step-down adapter B&W 67mm to 49mm model 1102871 — filter/thread reducer

The B&W step-down adapter 67mm to 49mm model 1102871 is a mechanical thread reducer that lets photographers attach 49mm filters and accessories to lenses with a 67mm filter thread. It maintains the correct alignment of the filter plane and provides a secure, threaded connection without adding significant bulk to the optical system. The adapter supports use of existing 49mm glass or plastic filters on larger lenses, enabling convenient consolidation of filter kits and flexibility when changing lenses during shoots or travel.

Advantages

The adapter delivers a precise thread fit between a 67mm lens and 49mm accessories, preventing wobble and ensuring stable mounting during handheld or tripod work. Its slim profile minimizes vignetting on wide-angle lenses while keeping the optical distance close to the original lens design. The metal construction provides reliable mechanical strength and consistent performance over repeated attachment cycles. The simple, screw-on operation makes attachment and removal quick and tool-free.

Suitable for

• Photographers who own 49mm filters and need to use them on lenses with a 67mm thread
• Travel and field work where reducing kit weight and number of items is beneficial
• Portrait, street, and landscape shooting where filter changes are required on multiple lenses

Key specifications

• Thread conversion: from 67mm (lens side) to 49mm (filter side)
• Construction: slim, low-profile design to limit vignetting
• Material: metal alloy for durability and stable threading
• Attachment: screw-on threaded connection for secure mounting
• Weight: lightweight to avoid substantially altering lens balance

How to use

Screw the adapter onto the front filter thread of the lens by aligning the threads and turning clockwise until hand-tight. Then attach the 49mm filter or accessory to the adapter by screwing it on in the same manner. To remove, unscrew the filter first and then the adapter, taking care not to apply sideways force that could stress the lens threads. Regularly check for tightness during extended shoots to prevent accidental loosening.

Usage recommendations

Use the adapter primarily when you need to reuse 49mm filters on lenses with a 67mm thread; avoid stacking multiple adapters or thick filter stacks on wide-angle lenses to reduce the risk of vignetting. Store the adapter in a protective pouch when not in use to preserve thread integrity and keep both lens and filter threads clean.