Just a quick one:
From my experience:
Dob mounts can get away with modified toucams etc, but i would say the results are about 2/10.
My dob now driven may be able to stay still for say 10-20 seconds and with then a canon 350, might be able to do some good shots of nebulae etc: 4 or 5/10
To justify the expense of a canon 20d or 5d or the dedicated slr, nothing short of quality and rock solid mounts thousands of $$
Budget is the main thing, you can do different levels, but it increses quickly
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