My two Kowa Six cameras focuses at different distances on same subject

Hi

I noticed that my second Kowa Six focuses differently than my working Kowa Six camera. When looking at the lens barrell it is focusing at 0.75m while I measure with a laser it is 0.68m to the object. My working camera focuses atound the 0.68m mark.

I expect it is the mount that has been "fixed" by previous owner with shims and it not in correct distance. My question is, will it matter much? I mean if I focus sharply with the focus screen will that not also give me the same sharpness on the film? Like if I were using a close up ring? Only issue would be focusing at infinity. Or am I missing something?

If the previos owner did not fumble with the mirror or the position of the ground glass, then ideed your only problem will be infinite focusing.

Have you tested with a roll of film?

I will test with film the coming week. The reason I think the mount was fiddles with is that it lacked the normal shims and had some plastic in stead. The plate also does not align like on my other camera. When I tried to remove the shims, I noticed that closing mechanisme got stuck. So I think that I have to have a look at the mount to see what is wrong. 2.5m distance becomes 4m, so that is not good.

Thanks for feedback.

I wouldn't try to interpolate values on the scale (is it the 55mm lens?), but indeed there is a sizable distance gap between your observations. BTW the distance scale is indicative of the distance from subject to the film plane so I'm not sure what you are measuring with the laser.

What's important is that the film and focus screen agree. You can test with ground glass, or run a roll for testing. Try distant and close subjects.

OAPOli said:

I wouldn't try to interpolate values on the scale (is it the 55mm lens?), but indeed there is a sizable distance gap between your observations. BTW the distance scale is indicative of the distance from subject to the film plane so I'm not sure what you are measuring with the laser.

What's important is that the film and focus screen agree. You can test with ground glass, or run a roll for testing. Try distant and close subjects.

Click to expand...

Yes, I only notice the discrepancy between my two cameras with the same lens and distance. One agreeing with the laser and the other always going further.. I'll test with a roll of film though.