Leitz Elmar-C 90mm f4 quick release but one major improvement is

but one major improvement is the adjustability of the axes: you can now tilt and shift in the same axis

and- despite absolutely no sign of this on the outside of the camera- the ability to shoot half-frame or full-frame images

Ednalite #659 adapter to use Series VI filters on Rolleiflex cameras with a Bay 2 filter mount

No MINT++++ here

The Yashica Tele-Wide finder is a good quality optical viewfinder with framelines for approximately 38mm and 60mm lenses

Leitz Elmar-C 90mm f4 quick release but one major improvement isThe Leitz Elmar C 90mm f4 lens is a compact short telephoto lens for M mount, originally designed for use on the Leica CL, but fully compatible with any M mount camera. Smooth focusing, good diaphragm, very very light edge haze which will not affect imaging, one small internal polishing mark visible under very bright light (which will also affect nothing)