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Dobs are the weapon of choice for many visual observers, generally if you want to photograph hen a driven equatorial mount is usually used, quick grabs of the moon and Jupiter can be had with a dob, but don't expect the close up sort of images of Jupiter.
Second hand can be hit and miss, you need to know the value of an item, just because its second hand doesnt mean its cheap, I tend to try to buy from those I know, those I don't particularly well, if they are a regular poster, chances are they know someone who will vouch for them that you may know. Otherwise it pays to have a look and see the quality. 99% of the items are generally good, and people represent themselves honestly. But as always ...... Caveat emptor . Usually items will come with pictures, but know your product and it's problems.... Ie rusty surfaces , scratches, dings, loose drives, etc and ask all e pertinent questions, get them to post close up shots of the mirrors, objective surfaces, focusers etc. If they are genuine they wont mind, in fact would be happy to do so.
I have bought 5000 dollar scopes unseen as I got a good referral from someone who knew the seller, and it turned up fine,
Cheers clive
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