Hi Howard, I don't have direct experience with the ETX, although I own a couple of Celestrons. I don't know if the same issues apply to a Mak as to an SCT, but anyway... In an SCT, the corrector is sometimes aligned by means of shims. If that's the case with a Mak, then you'll need to look for them and mark them in some way so the thing will go back together properly. But as Guy indicates, you didn't break the bank to buy this one. MC
OK everybody, time to get this list a bit active I hope.
I recently bought an ETX 90 for the tidy sum of $80. That's not relly necessary to tell you but I wanted to brag a little. I already have one but I'd like to give it to my son as a present since his interest in astronomy is increasing. Anyways it has a few very distinct fingerprints on the outer and <GASP> inner corrector lens surfaces!! I know I almost cried when I realized that they were inside. I've perused the web for cleaning tips solutions etc, specifically Weasners Mighty ETX site which is amazing by the way I've followed that site for over 10 years. I'd like to know of any local wisdom, tips, in this area and possible suppliesand/or ingredients to buy. Any and all help would be very welcome.
Thanks!
Howard