Thanks. A couple more questions, just to salve my curiosity. Is the
emulsion panchromatic or orthochromatic? Do you have a feel for where
its sensitivity peaks on the spectral curve?
-p
On 6/21/2021 12:00 PM, Godfrey DiGiorgi wrote:
Interesting questions, Paul. Answering in reverse order:
POP or std - The paper requires standard development processing, you cannot
just watch the image form as it is exposed to light (POP). The happy thing is
that it works with standard paper development chemistry and processing
techniques.
Contrast - The best I can answer is "I don't know." I've never used this paper
before so have no experience with it in a darkroom situation using standard tray
development. I estimated sensitivity at ISO 6, made exposures at ISO 6 and ISO 3 as a
test. My paper developer was so far out of date (which I didn't know until I started
mixing it) that I felt the results were going to fall way off the curve ... I mixed it up
at 1:31 dilution and gave the paper 12 minutes of development time (standard would be 1:9
or 1:14 @ ~2 minutes). The resulting paper image was very, very flat, with the ISO 3
images showing more useable tonal scale. I could probably have gone to ISO 1.5 and 20
minutes processing time with that defective soup.
With the Hasselblad's 907x/CFVII 50c sensor's great tonal depth, I was able to
get a pretty decent range out of the originals that matched what I had in mind
when making the exposures, but it was a bit more work than my usual film
captures.
I need to experiment with the paper some more. The simple thing to do would be
to get a cheap 4x5in field camera and some film holders, that would save a huge
amount of time in cutting down the paper sheets and fitting into the fussy
Mamiya Press 23 film holders. :)
G
--
Paul Sorenson
Studio1941
Sooner or later "different" scares people.
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