This allows you to attach specific Pentax binoculars(as well as other brands) which have a 1/4"-20 threaded tripod socket on the bottom of them to any tripod with a 1/4"-20...
The Pentax-110 50mm f/2.8 Lens is intended for Pentax 110 SLR cameras (110 film with a 13x17 mm frame was used) It has no aperture, as it is built into...
