Olympus 1.7x for 55mm thread brand_Pentax Worth noting as well that

Worth noting as well that while the BR1 will enable the mounting of S-mount tele lenses on an F mount camera

and a very unusual multi-shot function that can take from 1 to 4 photos in a row- just in case someone's blinked

most notably a bit of loose stitching around one edge of the ‘Domke’ label

the camera platform can be tilted up to 90-degrees for those cool Dutch angles that all the German expressionist kids are talking about these days

It's made of black nylon

Olympus 1.7x for 55mm thread brand_Pentax Worth noting as well thatThis is an Olympus 1. 7x teleconverter lens, designed to fit lenses with filter threads of 55mm. Light cosmetic wear, good optics. Includes adapter tube (shown)