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I might also offer a couple of thoughts…since you are both new, I would suggest joining an astronomy club…there are a number around. Some even offer learner scopes to borrow. Also a few viewing nights out with the group will allow you an opportunity to see some gear and try out a few things with knowledgeable and enthusiastic folks who I am confident will be thrilled to have some new (and younger) members…
After that, get your (son’s) money out and buy with some confidence.
There will also be a few other useful observation aids (like a good adjustable height chair, Telrad etc) that will certainly add to the viewing experience.
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