Today I tested the very small Industar 50mm f3.5. It is based on an old Zeis lens design from before ww2 and made in Russia. It focuses easy but the aperture ring is not easy adjustable with one hand, the focuses will change if you try to do this.
The photos are edited with Darktable, for most of them I only changed some tone curve and the B&W conversion. The tones of the colors have this nice vintage feel and the sharpens is good but not as overly sharp as modern lenses. Combined with the manual focus you can get some great results and because it is such a small lens there is no excuse not to bring it with you. I read online that this lens is not as good on full frame camera’s when it comes to sharpness in the corners and vignetting but I cannot confirm that. I like it a lot on the X-t1 and it is a good conversation starter.