varjohukka

Thank you, guys! That totally did the trick. Now it's sharp even with the 50mm @ f1.2  (well as sharp as it gets at this aperture). I'm excited

On my Rectimascop it's the backglass you can rotate, for me it took a nudge. You don't have to unscrew the backlens, just loosen the screws and give the backlens a nudge clockwise or counterclockwise. And fasten the screws when you get a sharp image via Vladimir's method

Here's some tips for u, maybe it will be helpfull: take some long focal lens and set it in focus (as much as possible in current condition) with rectimascope, u can use page with small font text as a focus target, loose the screws on a back lens of rectimascop, put rubberglove and place two fingers on opposite sides of a glass so there is space in between so u can see a result of your rotations in liveview (of course set it to max zoom). When u get a best sharpness press a glass tightly so it cant rotate anymore, put rectimascope vertically and tighten it. Then check sharpness again using liveview. Thats how i set sharpness with my d.o.industries 16f, things were easier for me because i rotate front glass, but i hope that scheme will work for u to)

I think this is your problem, had the same issue when I first received my Rectimascop. Now i can shoot wide open and still get sharp images, after getting it alligned