Nikon Nikonos IV-A with 35mm f2.5 lens mount_Nikonos focusing and diaphragm action are

focusing and diaphragm action are good

It doesn't affect imaging and it's not going to get any worse

and handholding is an adventure- but not without reason

Shutter speeds are good from 1/8s and up

Nikon Nikonos IV-A with 35mm f2.5 lens mount_Nikonos focusing and diaphragm action areThe Nikon Nikonos IV A is a rugged camera with a thick metal housing and O rings everywhere. The Nikonos was originally designed for deep underwater use, though we have not pressure tested this camera, so you should consider it weather resistant rather than waterproof. Scale focusing with aperture priority exposure automation. Excellent cosmetic condition overall, with minor wear and notably one somewhat mangled strap lug thats unlikely to be useful.