[rollei_list] Re: Rolleiflex mystery
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Wed, 10 Mar 2010 15:37:47 -0800
----- Original Message -----
From: "Laurence Cuffe" <cuffe@xxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, March 10, 2010 2:09 PM
Subject: [rollei_list] Re: Rolleiflex mystery
Sander I read your analysis, at first I found your
argument that the pattern persisted from frame to frame
convincing but when I examined the frames more closely I
find that the pattern is not constant. The image of the
pressure plate seems to imply that it is not totally flat,
so it may be a culprit, however If that was the case I
would expect some sort of a problem to be perceptible on
the C41 image, which it is not.
This would lead me to believe that its a film processing
issue or handling problem rather than a camera issue. One
distinct feature is the rather sharp and distinct edge to
the darker bands at the sides.
My thoughts would run along the lines of the following
hypothetical conversation:-
How much developer did you put in there joe?
350 mils like I always do.
350 mils? but I thought you were developing 120?
why? does that make a difference?
All the best
Larry Cuffe
FWIW, the "pressure plate" in a Rollei camera is not
actually that. Lets call it a back plate. The back plate is
spaced away from the film gate. In some rolleis the spacing
is determined by legs on the plate which contact reference
surfaces on the camera body. A couple of different
arrangements are used. The kind of back plate which shifts
from 120 to 35mm film changes the spacing when moved. The
gap between the plate and film gate is sufficient to clear
the thickness of the film and backing paper (or just film in
the case of 35mm). The film is actually pressed back against
the plate by its springiness, the plate applies no pressure
at all to the film. The amount of variation in film position
in the gate is very small. If the back plate is not flat the
error most appearant will be uneveness of focus. I think
this is pretty rare in Rollei cameras unless they have been
seriously damged.
Again, this is not a light leak, its the opposite of
what a light leak would do. I don't think its the camera at
all unless perhaps, there was some tape from the roll stuck
inside somehow and I think that is so unlikely so as not to
be a serious suggestion.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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