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Hi Dave,
Welcome to astrophotography. It's a
challenging but also rewarding hobby. The best films available for
astro work are slide films, Kodak E-200 and Fuji Provia 400. They can be
scanned on your scanner (I have the 1640 that works well). However, slide
film needs to be exposed correctly to get good pictures. Too long
exposures create "sky fog" where the dark sky is too light. This reduces
the range of image "signal". You can experiment with long exposures to
find how long you can shoot with your scope in your skies, then note that time
as you maximum limit. On the short exposure side, a dark slide is
difficult for the scanner to scan. There's no set minimum exposure time
because it depends on how bright the target is.
There are other films used by astrophotographers
with varying results, but the consensus is the above films are best for
now. There are a few color negative films being used, but they can
be hard to find - Konica 400 Centuria and Fuji SHQ200. The SHQ200
sometimes is carried by Walmart. It isn't as sensitive to red nebula as
the E200 and Provia400. Color negative film is much easier to scan and is
much less likely to reach a sky fog limit.
Good Luck,
Don |
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