Stroboframe System 2000 Auto Quick-Release  type_Filters because it's not an LCD

because it's not an LCD viewfinder in and of itself: it's an optical system designed to use the rear viewfinder on a Sigma FP camera

The scale-focusing 75mm f2

but this won't impact function of the lens otherwise

Please note: this lens is for the Nikonos underwater camera system

Easily concealable

Stroboframe System 2000 Auto Quick-Release &nbsptype_Filters because it's not an LCDI guess this system never really took off, but that's too bad, because it's actually pretty nice. The parts are well made from metal, lock together solidly, and have a really solid positive lock unlock feel. In excellent condition, with one camera plate and one base. Also includes an adhesive cork pad.