Re: [APML] recommendations for development of tech pan

["John C. Mirtle" <spampit@shaw.ca>]

Richard,
    I think the correct answer here is "it depends". I shoot it at two
extremes - f1.5 and f9. For f9 the choice is easy, D19 for 6 to 10 minutes @
68F. At this slow speed, every little bit helps. With the Schmidt camera,
it's a bit different. I have been meaning to try HC110 but haven't yet. I
use a shorter D19 time (4-5 minutes) and deep exposures. I like to get as
much faint nebulosity as I can possibly get, but this sometimes produces a
problem with D19. If there is a bright nebula in the field, it becomes so
black that a scanner can't pull any detail from it. I also switched to water
stop bath when using D19, due to pinholes in the emulsion. With the "mild"
HC110, I would probably go back to acid stop bath as well. The trick is to
get out there and shoot some film, keep notes of what you do. Eventually you
get a feel for what works best for the type of object, the sky conditions,
focal ratio etc. After 600+ tech pan images, on some days I still get it
wrong!

John Mirtle
Calgary, Ab. Canada

----- Original Message ----- 
From: Richard Crisp
To: Discussion of Film Astrophotography
Sent: Monday, September 15, 2003 12:52 PM
Subject: [APML] recommendations for development of tech pan


what is the consensus around here about how to develop tech pan 2415?

I am guessing nearly everyone does their own, but which developer, what temp
and for how long for the develop etc?

thanks
Richard




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