Hi all, This is my first time in this forum and I need some help. I have a Cannon EOS 20D and my brother had a telescope. He wants to borrow my camera to do some astronomy photos, he had the various linking rings necessary, and wants to know about something he calls "Dark Frame" - it seems it's a way of ensuring that the long exposures necessary for night time star images etc do not result in the night sky looking grey instead of black in the final image. I wanted to know if there's a setting I can find to use in my Cannon for this? I've searched in my dinky little instruction manual for the Cannon with no luck but maybe it's got another name? What should I be looking for? Would a combination of settings be what I'm looking for? Can anyone help? Fran

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