Hello All,
I’ve recently installed and set up a NiteCrawler focuser/rotator on my 4" refractor, and so far the autofocus routine seems to working great, however my first attempt at getting SGP to auto rotate to a plate-solved previous sub frame has been unsuccessful. I’ve read through some other posts here and on Cloudy Nights, but I’m not sure it’s helping me.
After installing my NiteCrawler, I attempted to go back to a previously imaged target and get the centering and rotation correct. As usual, the centering worked just fine, and without making any attempts at correcting the angle, I could tell I was off by only a few degrees, plus 180 because of a meridian flip. The plate-solved results showed an angle of ~270 degrees, which made sense because my camera is at 90/270 degrees, or ‘landscape’ when I’m in the home position. I stored that plate-solved result for my target.
I made numerous attempts to auto-rotate by right clicking on my target in the list and choosing the rotate option. Every time, the camera would rotate to what it thought was zero degrees, going the wrong way, with the error increasing in each iteration. I noticed that the angle shown by SGP was initially in sync with the rotator, at 0 degrees, but then would change drastically after each plate solve, even though the camera had not even moved yet. From reading some other threads, I believe this is related to SGP changing from a ‘rotator angle’ to a ‘sky angle’ as soon as plate-solving starts, and that the two angles won’t necessarily agree, but I’m not 100% clear on how/why this change happens.
So when I used my plate-solved image to define my target, I noticed that the angle of ~270 degrees didn’t make into the field for “Rotate camera to:”, and it was still at 0 degrees. So I did not check that box, thinking it was an optional manual rotation setting. Should I have checked the box and entered in the value from the plate-solved result? Was SGP trying to rotate to 0 degrees even though the plate-solved image was at ~90/270?
Also, my camera is about 90 degrees / 270 degrees to east of north, depending on which side of the pier, so is it OK to just enter ‘90 degrees’ in the Equipment Profile in the Camera tab?
Any help would be greatly appreciated.
Thank you,
Jeremy