Vivitar Series 1 800mm f11 VMC Solid Catadioptric Lens for Nikon F scanning diaphragm is clean

diaphragm is clean

but these cameras do have some interesting features: autofocus is pretty darn quick

This version has an 8-bladed diaphragm

flip locks

and it's not an effect easily achieved in post

Vivitar Series 1 800mm f11 VMC Solid Catadioptric Lens for Nikon F scanning diaphragm is cleanAn 800mm lens that's less that 10cm long? Yes please. To be fair, it's also 10cm across and weighs 1. 5kg, but that's still pretty darn impressive. Smooth focusing, clean optics, remarkably good imaging (with the usual out of focus donut shapes, of course.) An unusual lens in excellent condition. This is a T mount lens, compatible with most film and digital camera systems; it includes a Nikon F mount.