William Laven (wmlaven@platinotype.com)
Tue, 29 Jun 1999 11:54:30 -0700 (PDT)
>William Laven wrote:
>>
>> I have said that often. In my tests, Super Actinics, which emit a narrow
>> band peaking at 420nm, print faster then traditional "black light" bulbs,
>> which emit a broad band that peaks at 350 or 360nm. A friend of mine did
>> comparisons of BL vs. Super Actinics with POP and found the SA's produced
>> shorter exposure times and at least a grade's worth more contrast.
>
>Not to purposely throw a 'monkey wrench' into the discussion, but do the
>'shorter' times apply both to 'staight' negs and to ones processed in Pyro?
>
My tests were done on negs in HC110. I've recently switched to Pyro and
while some negs definitely take longer than the silver negs, I've not
compared BL's to SA's w/those negs. It would be an interesting and valuable
test, though, since the pyro stain would presumably blocks different
percentages of the lights; the SA's, having more "blue" light, might block
even more. Maybe someday, some year, I'll test again, but I'd like to keep
making pictures not test strips.
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WILLIAM LAVEN PHOTOGRAPHY
Workshops and tutorials in Platinum/Palladium printing and Zone System.
1931 23rd Street, San Francisco, CA, 94107
415-647-9432 (voice) 415-647-9438 (fax)
wmlaven@platinotype.com
http://www.platinotype.com
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