Minolta right angle finder brand_Sekonic Other features include a clock

Other features include a clock

you might be

This helicoid is about 3cm long

and a clean 50mm f1

Pentax rolled the dice on SLR design sometime in the late 80s and it didn't quite catch on

Minolta right angle finder brand_Sekonic Other features include a clockThe Minolta Angle Finder slipS onto the viewfinder of compatible cameras and provides a rotating, focusable view of the groundglass with switchable 1x 2x magnification. Ideal for copystand or precision macro work, this angle finder will fit most Minolta manual focus SLR cameras with rectangular viewfinders; may fit other cameras, but no guarantees. In very good cosmetic condition, with light surface wear, clean optics.