Asahi Bellows Unit iso_800 it cannot be directly used

it cannot be directly used on a camera with useful results

Optics show some dust

The autofocus speed is not as lightning-quick as Nikon's huge professional 200-400mm f4 VR

it's a Promaster

Paint wear is most evident on the back- it's not the end of the world

Asahi Bellows Unit iso_800 it cannot be directly usedThe Asahi Bellows Unit is a bellows for M42 thread mount cameras and lenses. Provides more than 2x magnification with 55mm lenses, according to the on rail scale; should do similar work with other lenses of similar focal length. Smooth geared adjustment, good locks. There is a tripod socket at the camera end, but it's pretty minimalist, so you may want to stick with smaller lenses. With original box.