People here who recommend buying bargains on Craig's list and Amazon are knowledgeable hobbyists. See their thousands of posts here. If you do not know what you are buying -- telescopes, cars, refrigerators, whatever -- buying used is just buying someone else's problems.
It absolutely is. The gamble is that the discount vs the new cost will be more than worth fixing whatever problems those are. You can do very well that way, but it takes a certain familiarity with the equipment, such that you can recognize the problems, repair them, and get the instruments back into proper adjustment. It may definitely not be up a newcomer's alley, especially if they're worried about buying a scope that will need collimated.
On the other hand, if you want to learn about the equipment, beat up, used stuff could be a perfectly good way to do so, and it can be a great bargain.
I recently bought a Celestron 114mm f=900 spherical Newtonian on a really solid old equatorial mount from Goodwill for $40, shipping and all. It turned out to need serious cleaning of the mirrors and the rack and pinion on the focuser, the latter of which was completely disassembled and re-greased. I also put probably twenty more dollars into hardware store parts to build a new center brace for the tripod, so I'm up to sixty dollars on it.
It's a solid performer now, though the finder scope is not great, and it came with an eyepiece that I thought was an old Kellner, but it seems to be a Cave Orthostar. I couldn't have purchased just the eyepiece for that money, by itself, on the used market. As you may know, they don't come new these days.
Anyway, you can't get deals like that new. Is it a foolproof way for a new astronomer to get decent equipment? No. Is it worth looking into, if you're good with tools and machinery? I think so.
Chris
Edited by Protheus, 25 January 2023 - 01:05 PM.