Helios-44-M 58mm f2 for M42 brand_Fotodiox and the rear element has

and the rear element has an almost invisible coating mark on one edge which won't affect imaging

and good diaphragm action

very minor cosmetic paint wear

If that sounds to you like the future of photography and not a nightmare hellscape of wireless connection troubleshooting and forced obsolescence

Helios-44-M 58mm f2 for M42 brand_Fotodiox and the rear element hasThis Helios 44 M 58mm f2 is a classic Soviet revision of an earlier Zeiss design, designed for the M42 thread mount. Smooth focusing, some oil on diaphragm which does not affect function, minor internal dust; cosmetic condition is very good. A fun lens in pretty solid shape.