I had a question for the iOptron AZM Pro users/experts out there.
I assume the sound I will describe is not normal, but is the noticeable movement (in small jerks) of the image while tracking normal?
Here are the details:
6 months ago I bought a new iOptron AZM Pro and mounted a 102mm f7 refractor on it and used the 10lb counterweight on the other size. The mount was mostly quiet except for (while in the "zero position" with the OTA pointed straight up) if I rotated it around the azimuth to check the level with the bubble level positioned over each of the 3 leveling thumbscrews there were 2 points in the 360 degree circle of rotation where I would hear a slight grinding noise. Fast forward to present day and when I do the same thing (rotating around azimuth in zero position) I hear a metal squealing sound most of the time when rotating around the azimuth in the counter-clockwise direction but just the normal hum without any squeal when I rotate in the clockwise direction. Nearest I can tell I have the mount properly balanced in alt and az.
I recently put a 16lb c8 (ota,rail,diagonal,eyepiece) on it (and 17lbs of counterweight) and when looking at a star with my 14mm eyepiece (so 145x) the star was jumping around like a "W" as the mount tracked in alt and az. Clearly this was not right.
Last night I went out to try again with both my original 102mm f7 refractor (10lb counterweight) and then my c8 (17lb counterweight), and here are the details of that experiment:
When using my 102mm f7 at 100x every 2/3 of a second or so the image shifts. There is a slight dampening time of the OTA for the image to settle after every movement and the star is slightly blurred during this dampening time.
Everything else I tried with the c8. Again at 145x with the c8, every 2/3 a second or so the image shifts and the stars go out of focus for a brief moment as the scope stabilizes before the image shifts again. It is like the tracking is in discrete steps that are like tapping on the OTA and not like a smooth motion. At 25degrees the stepping is more noticeable though not nearly as bad a previous session that prompted this testing. at 41.6 degrees the movement of the image was better, it was more like going out of focus for a moment instead of moving in discrete steps. again looking at another star at 21.1alt 80deg E (probably 100degrees to the left in azimuth of my previous observations) the steps and damping was noticeable. Looking near azimuth seemed to be better in general. I assume this is not normal or am I asking too much of the mount? Am I doing something wrong? Is there a user adjustment I can do to the mount or something else to do or do I need to immediately get on the phone to iOptron tech support?