I have had probably four of these, and was disappointed in all of them with the optics. They would go to about 80X OK, but no further. So I would sell it, and read a forum from someone saying how good the optics was on theirs, so I would try another one, and the same thing. It took me about 2 or 3 more tries until I learned my lesson. I still see forums from owners saying how good the optics are on theirs. So I guess I just bought a bad one every time. They are nice little scopes, and there are probably good ones out there, but the good ones will be kept, so getting a good one is a slim chance I think now.
I may have been lucky with mine. There is a little bit of slop in the threads because the immage will shift a bit when focousing but with patience it will sharpen up. Last night must have been unusually good seeing because I was able to push mine further than I have before on the moon.
First using a 12mm ortho for x83 and it was very crisp, then tried my luck with a 4mm ortho for x250 and to my surprise also a very clean immage only darker. Unfortunately my skills at holding an iPhone to the eyepiece are lousy.
Edited by Moffett, 14 January 2019 - 03:12 PM.