How the adapter ring works

The first value in the 46-39 mm designation refers to the lens or tube thread, while the second refers to the filter or accessory thread. Screw the ring into the 46 mm thread, then attach the 39 mm accessory to the ring.

Matching thread sizes

Before ordering, check the front-thread diameter on the lens and the thread diameter of the filter or converter. This version connects a lens-side thread of 46 mm to an accessory thread of 39 mm. Using a smaller-diameter filter can cause vignetting with some lenses and focal lengths, so compatibility should be checked for the intended setup.

Technical data

• Type: Step-down filter adapter ring
• Lens/tube-side thread: 46 mm
• Filter/accessory-side thread: 39 mm
• Model: 46-39 mm

Package includes:

• Genesis Gear Step-Down Ring 46-39 mm
• original packaging