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Gary, here's what I would suggest but you are right, some of this is very
much a function of trying out your ideas and seeing what works with you
equipment and site:
Push E200 1 stop
Expose 90 minutes if your site is very dark but you might want to do some
shorter exposures like 45 min then 60min then 75 min first and see what you get.
I go 40min at f/4 on 400 film so my math says you should go 2.25x at f/6 with
E200 pushed one stop. Sky fog limit is the thing you are after.
----- Original Message -----
Sent: Thursday, March 18, 2004 3:17
AM
Subject: [APML] ELITE CHROME 200 EXPOSURE
QUESTIONS
I received my Lumicon Easy Guider during last full moon and took some
shots to learn how to use it. This weekend I'm planning on trying my
first guided prime focus shots. My site is about 20 miles from the
nearest city so the skies are fairly dark but I do have a few local light
issues. My equipment is as follows:
Stellarvue 80mm f6 Achromat
Nikon FE2
Losmandy GM-8
Lumicon Easy Guider
Elite Chrome 200
My questions are concerning exposure times. First of all, should I
push 1 stop or shoot at 200? I've read that you should square the focal
ratio of the scope. Is this correct or does it depend on the darkness of
the site? Can anyone recommend a min. or max. exposure time for
this film (pushed or not) using an 80mm Achromat. I realize I'm not
going to get the image quality of an Apo but I will be using this scope until
later this year when I plan on getting a triplet Apo. I would
appreciate any advice or suggestions anyone can give me. Thanks!
Gary
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