Cavision Clamp-on Step-up Ring for 86mm Thread Lens to 3.65" - Ring Rear: 90mm (ID) Clamp, Ring Front: 3.65"

• This ring allows you to use a 3.65" bottom threaded Conversion Lens or Filter, on a 86mm front threaded lens

The rear of this Clamp-on step-up ring is 90mm ID (inside dimension). It clamps on to the front of a lens that has an 86mm filter thread, stepping it up to accept 3.65" add-on lenses or filters, as the front of the step-up ring is a 3.65" ID thread.