37 43 mm Step up

General Brand 37mm-43mm Step-Up Adapter Ring (Lens to Filter)

the raynox ra43375 adapter ring allows users to attach a 43mm lens accessory or filter to a camera with a 37mm filter mount size that has a thread pitch of 0.5mm - typically found ...

Allows you to use larger size filters on lenses with a smaller diameter thread. The first number is the size that screws into the lense, the second number is the filter size.

37-43mm Step-up Ring (Lens to Filter)