This is an Adjustable Fresnel Attachment from Hive Lighting. It’s compatible with the Wasp 100-C, Bee 50-C and Horner 200-C. The Adjustable Fresnel will maximize the control over your light source. The user can adjust the beam angle from 15° to 50° either spot or flood when is required.
Moreover, the Fresnel can be used with optional 5" barndoors or a 5" speed ring. Both have the same compatibility as the stock reflector. You can remove it to swap between Fresnel and other accessories