comm64 -
here is a link that gies you some basic info how t get started with a canon dslr - t might explain a few things for you
http://www.covingtoninnovations.com/...300Dastro.html
this next link has a whole lot of tips/techniques for all cameras - and gives a comparison of canon vs nikon
http://www.astropix.com/HTML/I_ASTROP/TOC_AP.HTM
hope this helps.
ps - this is a member's website with some basic instrucions of things to considr when taking astro pics
http://www.asignobservatory.com/Astr...aphyGuide.aspx