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Bcostin
Tinkerer
Username: Bcostin
Post Number: 1
Registered: 09-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 07, 2007 - 01:06 pm: | 
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My first test roll through a 1000DTL I picked up shows some unusual scratches on the base side of the film. While checking for rough spots I noticed that the pressure plate seems to slide back-and-forth on the springy mounts quite a bit. More easily than I'd expect. I don't know if there'd be enough friction make it shift when the camera is loaded or not, but I can't think of any good reason for it to move at all.
I don't have another M/S body for comparison. Is this normal, or something suspicious I should try to fix? |
Turnergande
Tinkerer
Username: Turnergande
Post Number: 13
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 07, 2007 - 08:32 pm: |
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I checked my (seldom used) Mamiya/Sekor 500 TL & 1000 DTL pressure plates. The TL is rather loose vertically & horizontally whereas the DTL is quite snug. Out of curiousity I checked several other 35mm SLR brands & models and maybe half tend to be a bit loose lengthwise but rather tight up & down. The other cameras had snug pressure plates. I'm not sure how that relates to friction, scratches or possibly static on a processed print. I can say that I have not encountered your results (scratches) while using many different cameras over the last 40 years but maybe I've just been lucky. |
Herron
Tinkerer
Username: Herron
Post Number: 1
Registered: 08-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, October 19, 2007 - 12:59 pm: |
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There should be some movement in the pressure plate, but it should be a minimal amount. If there are no burs or obvious rough spots, are you sure it was from the camera, and not something that happened in developing? If you're using some of the (rapidly vanishing) walk-up developers in stores, my experience with them is less than good. The operators are usually ill-trained, and the equipment not kept up and cleaned like in the "old days." |
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