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#1
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Pressure or Processing?
I shot a zone three through seven gray sheet
series with my RB67 Pro S for test purposes. I noticed that the negatives had noticable transverse density variation. The grey sheet is OK. Uneven development first popped into mind. Then it occured to me that the cause might be due to pressure affects. I often advance to the next frame using two or three partial moves of the film advance lever. Could my film holder have too much of a grip? Could there be anything to it; pressure marks due to to film advance? Dan |
#2
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Pressure or Processing?
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#4
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Pressure or Processing?
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#5
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Pressure or Processing?
John wrote:
Is there any regularity to the variations ? Enough to suspect a pressure problem. The 20 X 30 inch Sturdy Board is Very uniformly grey coated one side. I always expose a series at a time of uniform sky lighting. Only takes about five minutes. I like the zone three through seven series because it contains the zones which print and can be easily done at same stop OR at same shutter speed. I'll finish a series today if the light holds steady. Delta 3200 is loaded rather than the Pan F+ refered to in my first post. I did notice yesterday while shooting frame one quite a lot of resistance when advancing to frame two. The film holder has two screws, film and take-up, which may adjust film advance resistance. Dan |
#6
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Pressure or Processing?
wrote:
I shot a zone three through seven gray sheet series with my RB67 Pro S for test purposes. I noticed that the negatives had noticable transverse density variation. The grey sheet is OK. Uneven development first popped into mind. Then it occured to me that the cause might be due to pressure affects. I often advance to the next frame using two or three partial moves of the film advance lever. Could my film holder have too much of a grip. Could there be anything to it; pressure marks due to to film advance? Dan Too vigorous and too much agitation of the Pan F+ are likely the cause of the transverse density variation. The out of date by three years Delta 3200 I processed in a carbonated non-restrained developer was well fogged but very even in density. I made zone 3, 5, and 7 gray board exposures. Dan |
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