Benro Master DR6746 67-46mm Step Down Ring camera filter

Step-down ring for 75 mm holder

The Benro Master DR6746 is a step-down adapter that lets a 67 mm filter mount onto a lens with a 46 mm thread. It is designed for photographers who use the Benro 75 mm Professional Filter Holder system and need to fit smaller-diameter lenses into that workflow.

Thread-mismatch limitation

A step-down ring reduces the front diameter, so the filter glass becomes larger than the lens opening. This can introduce vignetting on wide-angle lenses because the filter rim encroaches on the image circle. The adapter adds 0.5 cm of thickness to the optical path, which may affect focus stacking or close-up work where every millimetre counts.

Check lens thread and filter size

Verify that your lens has a 46 mm front thread before ordering; other thread pitches will not engage. Confirm that the filter you intend to use is a 67 mm circular type, as square or rectangular filters require a different holder. The ring weighs 9.07 g and measures 7.9 cm across, so ensure your lens barrel can support the extra diameter without fouling a hood or cap.