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Old 22-03-2010, 09:21 PM
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dugnsuz (Doug)
to baldly go...

dugnsuz is offline
Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,200
I routinely image in the "drunk or desperate or both" and "noobies on a rampage" range and I don't do so badly - cheers!!

That said, my best results always coincide with lower ambient temperatures, but that would occur with all iso settings and the temperature variations of the seasons.
I can only offer an anecdotal approach (from experience) to this in that I find iso1600 the sweet spot for astro imaging with the 40D - lower temperatures and many subs being the winning factors.
My mantra is "experiment" and try to push the envelope whilst doing it! I could never go back to 400 or 800 especially with my f4 lenses.

Depends on how much time one wants to devote to an image - if you want it all done in one night, then low iso will get you a smooth image with a certain amount of data in it. I favour the 10-15min subs at high iso over multiple nights (20+ subs) approach which really opens up the capabilities of the DSLR.

Great exercise for showing the 40D noise profile, but "happy medium" isn't where I want my images to reside
All the best.

Last edited by dugnsuz; 22-03-2010 at 09:54 PM.
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