RF can`t be adjusted to infinity ....

[nobbylon]

I had this for the first time in dozens of M's. Adjust the other screw, the one that extends or shortens the arm and then adjust the eccentric. Loosen the central screw and then first shorten the arm as far as possible on the cam, re tighten and then adjust on the roller eccentric. Keep trying combinations until it works and then adjust for 1m first, then infinity.
It perplexed me for a while!

 

[helen.HH]

BUMMER Gabor.... Miss M4-2 testing your 'love'
did she and Miss Nocti have a Fight

well hopefully she will be on the mend and in fine working order

 

[micromoogman]

I had this for the first time in dozens of M's. Adjust the other screw, the one that extends or shortens the arm and then adjust the eccentric. Loosen the central screw and then first shorten the arm as far as possible on the cam, re tighten and then adjust on the roller eccentric. Keep trying combinations until it works and then adjust for 1m first, then infinity.
It perplexed me for a while!

That routine is for 1m and infinity. If the optics have had a bad hit and it's way off then you must get the top off and tweak the wedged optic element at no.1 in the picture above.

 

[maddoc]

BUMMER Gabor.... Miss M4-2 testing your 'love'
did she and Miss Nocti have a Fight

well hopefully she will be on the mend and in fine working order

Thank you Helen! I tend to think more that a repairman was testing my patience .... Hopefully I get the M4-2 back to working order without to much hassle!

That routine is for 1m and infinity. If the optics have had a bad hit and it's way off then you must get the top off and tweak the wedged optic element at no.1 in the picture above.

So the proper way would be to first test the two screws of the cam-follower and if that doesn`t work then removing the top plate and trying to adjust the wedge? If the wedge is dislocated, wouldn`t it show up as partially showing a black area in the small left RF window when pointing the VF eye-piece against a bright light source?

 

[micromoogman]

Thank you Helen! I tend to think more that a repairman was testing my patience .... Hopefully I get the M4-2 back to working order without to much hassle!



So the proper way would be to first test the two screws of the cam-follower and if that doesn`t work then removing the top plate and trying to adjust the wedge? If the wedge is dislocated, wouldn`t it show up as partially showing a black area in the small left RF window when pointing the VF eye-piece against a bright light source?

It's probably not that dislocated. Just a fraction off there is a big difference in the viewfinder. All cheaper construced RF's like Hexar RF, Minolta CLE have that wedged prism as their only adjusting point. Try to make a thin blade that fits into the slots in the wheel. Maybe a needle will work.