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Hi Ryan, You're up against it with the 350D not having "Live View". IF you
want to persevere with widefield it might be a good idea to sell the 350D
body[$100-125] on ebay, and get an 1100D body[$150-200] on ebay.
Higher max ISO, Live View, bigger LCD screen, and not as noisy.
In case you didn't already know, the focusing ring on all DSLRs goes beyond infinity, so you go to the end and then come back a little. For AP the focus has to be absolutely spot on; achieving this through the viewfinder is almost impossible except by luck. Your best chance is to focus using the brightest star available [Sirius and Canopus are both up at the moment], and then swing to your target. You can also use the moon if it is somewhere in the sky at the time. Some people even stuff around focusing to the best of their ability and then take a short exposure, check the focus, make a small adjustment if necessary, and repeat until they get it right--tedious to say the least, especially as the focus will change with ambient temperature changes, so you have to go through the rigmarole all over again.
You can use a Bahtinov mask with large lenses and telescopes, but I'm not sure if one would work with small lenses; somebody will almost certainly know the answer to that. As far as I recall there is no problem with APS-C lenses coming to focus when fitted to a full frame model.
raymo
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