Posted by Gerald Pierce on October 14, 2000 at 19:26:26:
In Reply to: Re: Focus problem on Century Graphic posted by Dennis Lee on October 14, 2000 at 17:36:26:
Dennis:
I mentioned the cable release because I had
the same problem once, and traced it to the
fact that I was not using one. And I was
shooting at 1/60th. It doesn't take much
to cause a problem. Is your lensboard snug?
Some generic boards don't fit as tightly as
the originals. You could be causing the
problem with a slight movement of the
lensboard. It's my guess that the problem is
a difference between the lens-to-film and
the lens-to-glas- caused by some misas-embly.
(mis-reas-embly?) You can tell that by
seeing if there is a plane in focus in the
images you have, or by doing the test
I suggested. Obviously, shoot wide open for
shallow depth of field. It isn't as scientific
or as accurate as Les' suggestion, but I think
it will point you in the right direction. There
could be a mechanical problem in the lens like a
misalignment of the elements. Just keep
plugging along, eliminating the possibilities.
Regards,
Gerald
: Good ideas Gerald,
: I'll try the 'depth of field' test tomorrow. The camera was
mounted on a solid tripod but without cable release.
: I just can't imagine that's the problem. Especially at 1/60 or
1/125 with a very delicate touch.
: Is it possible this lens could be losing quality at f16/22?
: Also, is it possible for the GG to be installed incorrectly on
the Century? I did remove it once and then replaced it dull/matte
side facing forward.
: It's very frustrating. I've already lost some good pictures.
Thanks for your response.
: DL