So, I have a new Celestron 9.25" Edge, which I'm using on a new iOptron CEM70 mount. My experience to date has been with a simple, 100 mm refractor on a Meade GEM mount. I have never owned a reflector before.
Out of the box, there have been issues with focusing. The star or planet would reduce almost to the point of being sharp but then enlarge again when I turned the focuser. So, I checked collimation by blowing out the focus on a bright star. Sure enough, the circle in the center was not centered. It was off to the left. Following the instructions, I used a screwdriver to adjust the screws, just a little, but, very quickly, the object became extremely dim. I don't know whether the circle in the center moved at all -- the object just grayed out! So I slewed to the moon and even that was very dim. I have no clue what happened. Any suggestions? I hope I haven't totally knocked the secondary mirror off-center.