Valdai 58mm f2 Helios-44-2 for M42 brand_Rowi Canon 200mm f4 S

Canon 200mm f4 S

The Asahi Magnifier slips on to your compatible Asahi Pentax SLR and provides a magnified image of the central viewfinder- helpful for macro work or whenever precise focus is critical

not a modification

This medium-sized version provides good airflow without taking up half your camera bag (unless it's a really small bag)

and shockingly tiny

Valdai 58mm f2 Helios-44-2 for M42 brand_Rowi Canon 200mm f4 SThis Valdai 58mm f2 Helios 44 2 is a classic Soviet revision of an earlier Zeiss design, designed for the M42 thread mount. Smooth focusing, good diaphragm, minor cleaning marks on front element, very light edge haze nothing dramatic. Includes front and rear caps.