You will get as many answers as there are cyanotype folks. Paper,
water, chemistry, films, light source and even the humidity in your
printing room all effect the answer. I give 1/3 stop more exposure and
add about 10% more development time (compared to silver gelatin).
Pinholes can often be rather low contrast to begin with, make sure your
silver gelatin development time is giving your a grade/filter 2 as an
average.
Because both the fun and curse of pinhole is unpredictability (at least
in my hands) you may want to consider post treatment of negs to adjust
them to match alt processes. Selenium works well to increase a
developed neg's contrast range. See here:
http://www.ferguson-photo-design.com/alternative/altinstruct19.html
The best plan (by far) would be to shoot and test BEFORE a big trip!
--------------
Tom Ferguson
http://www.ferguson-photo-design.com
On Nov 28, 2005, at 8:23 AM, Bob wrote:
> I'm off to Prague at the weekend and I'm taking my 10"x8" pinhole
> camera with me. The plan is to shoot a combination of Maco Genius and
> paper negatives, with the intent to do some Cyanotypes with the Maco.
>
> Should I be looking to expose for longer, or develop for longer to get
> an acceptable negative with the Maco film...?
>
> Cheers,
>
> --
> Bob
> http://www.bobarnott.com/
> -----------------------------------------------------------------------
> -
> "Lager is an imitation Continental beer drunk only by refined ladies,
> people with digestive ailments, tourists, and other weaklings."
> - Munchen Süddeutsche
> Zeitung
>
Received on Mon Nov 28 11:48:00 2005
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