Fed 2 with Jupiter 12 problems

[ForestCap]

So now, how do I sort the Jupiter 12 ???

http://www3.telus.net/public/rpnchbck/checking lens working distance.html

From the wonderful Kiev Survival Site

If you don't have ground glass you can use matte-finish tape instead, but make sure they are flatly attached on the film transporting rail but not the black area around film gate opening.

 

[David Hughes]

Hi,

Regardless of the lens in use the RF cam should be in the same position for the same distance. So a micrometer could measure the distance to the lens's flange from the tube that pushes the RF cam back...

Just a thought. Regards, David

 

[Bridgey]

Hi folks, started de-assembling jupiter 12, under focus ring i saw these pairs of marks where the grub screws have been sitting. The ones to the right are where the focus ring lines up with the stops at 1m and infinity. I wonder what the marks to the left are from. Previous setting perhaps????

[/URL][/IMG]

 

[Ko.Fe.]

Yes, it is from previous alignment for different camera. Usually you have to do it if shims were changed or heliciod was assembled differently. Shims and helicoid assembly are affecting focusing. Very.

 

[Bridgey]

Eureka!! I hope, forgive the erroneous terminology, but i noticed on dis-assembly that the aperture housing with the shims on, was not tight against the external housing. Hopefully, by default, i've cured the problem.

I might be stupid, but at least i'm not clever.