Thanks Bill, Duncan, and Chris! The sky cleared last night so I gave
it a shot. I could not get it to focus using the star diagonal and 2X
Shorty barlow. I'm going to check it out in the day to see if I can figure
it out. I guess I'll just have to deal with the 3X Prism diagonal for
now. As for the Fuji film, it's called Fujicolor Press DX 800
ISO. Since the sky was clear I thought I'd give it a test. I took
various exposures with my 55mm lens @ f/4 and a few prime focus shots through my
80mm f/6 achromat. I should have them back by Wednesday and will post
my results.
----- Original Message -----
Sent: Monday, October 11, 2004 8:46
AM
Subject: RE: [APML] Film and OAG
Questions
Gary, welcome to the world of off axis
pain and suffering. I use a 2x barlow for my visual guiding, 3x is too
much and makes the stars much too faint. Just remember to calculate your
maxium guiding tolerance and be able to see it clearly in the guiding eyepiece
is the key. so if your tolerance is 5 arcsec, know what that looks like
by spliting doubles in the guiding eyepeice. Try epsilon lyra for
example.
Chris
Hello,
I bought a roll of Fuji Superia 800 and was
shooting with it at a festival today. I didn't use all 36 exposures
and was wondering if this film is any good for astrophotography. I've
forgotten what it actually said on the film cannister itself, but on the
film tube it came in it reads--Fuji Superia CZ135-36 800 ISO. Just
wondering if it's worth my time to finish the roll under the stars or
not.
I have a Lumicon 2" Easy Guider and the
(Lumicon) recommended 3X Prism Diagonal. I guide with a 10mm
illuminated reticle. I'm using a 480mm f/6 80mm achromat.
My problem is not so much in finding a guidestar (although that is a
challenge at times), but having one bright enough that I can actually see
well enough to guide with, without having to use averted vision.
Is there a reason for using a prism instead of a star diagonal? I
realize having a 3X magnification is going to make the guiding easier and
more accurate, but would I get brighter guide stars by using a star diagonal
and 2X barlow? Would I be able to focus the guidestar with this
set-up? The sky here is socked in or I would try it out.
I'd appreciate any thoughts or knowledge anyone might bestow upon me.
Gary
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