Fuzzy Jupiter 3 lens

[thawkins]

I have a Zorki "C" camera with the Industar 50mm F3.5 lens. It is very sharp and has nice contrast. Wanting a bit more speed I purchased a very clean (no haze or fungus) Jupiter 3 50mm F1.5 lens. Beyond twenty or thirty feet it doesn't focus very well. All the pictures are out of focus. I understand this may be a common problem with the Jupiters. Is there a solution?

Thanks,

Tom

 

[xayraa33]

I have a Zorki "C" camera with the Industar 50mm F3.5 lens. It is very sharp and has nice contrast. Wanting a bit more speed I purchased a very clean (no haze or fungus) Jupiter 3 50mm F1.5 lens. Beyond twenty or thirty feet it doesn't focus very well. All the pictures are out of focus. I understand this may be a common problem with the Jupiters. Is there a solution?

Thanks,

Tom

the lens needs some collimation via shimming.
Brian or Kim are old hands at this.

 

[Sonnar Brian]

Chances are the shim needs to be reduced. The optics are too far from the film, so it can't reach infinity. About 0.1mm~0.2mm will probably work. You can't look at the film gate with the Zorki C.

 

[thawkins]

Also when the lens is mounted the F1.5 mark is not centered. It is perhaps a millimeter of two to the right (looking from behind the camera) of vertical. Could that be the problem? Thanks for the replies. Where can I get the reshimming and collimation done?

Tom