From: Ellen Sigunick (sigunick@yahoo.com)
Date: 02/01/01-08:31:49 PM Z
Sandy (and all of you who might have advice!),
I have been developing 16x20 negatives in trays, and I
am having the same problems that you mentioned, ie -
the scratching and uneven development. I am looking to
improve this process, and so I was wondering what kind
of drums you use to develop your large format negs?
Anything affordable?? I was going to just take a trip
to the hardware store and see what I could come up
with. Any recommendations??
Regards,
Ellen Sigunick
--- Sandy King <sanking@hubcap.clemson.edu> wrote:
> Nelson Goforth wrote:
>
>
> >I tried the BTZS tubes for three sets of negatives
> (mostly doing the tests
> >to determine proper dev time), and liked them save
> for one problem - I got,
> >on at least one neg per batch of 6 - flaking of the
> emulsion. One small
> >flake (not a scratch, but an irregular flake) that
> had come loose and then
> >laid back down on the emulsion.
> >
>
> What caused the flaking of the emulsion in your use
> of the BTZS tubes is a
> mystery to me but but this is a very unusual
> problem. What film was it?
> Some films have very soft emulsions that will flake
> off rather easily, FP5+
> for example.
>
> I don't use BTZS tubes but I do develop in tubes, in
> tubes made from ABS
> plastic for 5X7 and 6.5X8.5, and in print developing
> drums for 7X17 and
> 12X20 film. I find this type of development highly
> consistent and reliable.
>
> Phil Davis pionered the use of film developing tubes
> because tray
> processing was simply too inconsistent for
> sensitometric use in his BTZS
> sensitomety workshops. As is commonly known, uneven
> development is very
> common with tray processing, for a variety reasons I
> won't go into here.
> Persons with refined technique who understand the
> nature of the problem
> inherent in tray processing can come close, but in
> my opinion not exceed,
> the level of eveneness possible with rotary
> develoment in tubes.
>
> I switched from tray processing to tube processing a
> number of years ago
> and have never looked back. I prefer it for the
> following reasons.
>
> 1. Most of the film processing can be done in the
> daylight. After many year
> of working with photography I have a profound
> aversion for standing around
> in the dark for long periods of time.
> 2. With the larger film, which is rotary processed
> in tube on a motor base,
> I am free to do other things while the film is
> developed.
> 3. Development in tubes has almost entirely
> eliminated the problem of
> scratching and gouging of the film that plagued my
> tray processing.
> 4. Development in tubes by rotary processing gives
> more even development
> than tray processing.
>
>
> Sandy King
>
>
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