Posted 10 May 2010 - 10:27 AM
I have my CGE Pro on a pier, and asked the cement contractor to alight the pier bolts in a particular fashion; when he did a poor job of. So when I do a two star alignment, the two stars the mount points me too are very much off from where the 'scope is aimed. Once I have added additional stars, the GOTO gets close to the object, but not on it. When I tell the 'scope to go to Polaris, the 'scope is very much left of center.
So before I tear all of this down, and try to get the 'scope to point at Polaris when in the switch position (both axis centered), I just wanted confirmation.
Posted 10 May 2010 - 11:34 AM
If you have the polar scope in the mount you would first roughly aim it at Polaris.
Then you adjust the altitude and azimuth to get Polaris in the correct spot in the polar scopes reticle.
Next you would want to do a drift alignment to get it exact.
Posted 10 May 2010 - 11:35 AM
With my 10" SCT, focal length = 2540 mm, my lowest magnification eyepiece is 51X, about 1 degree FOV, so if it is exactly pointed at the NCP to start, Polaris is 1/4 degree outside the field. A marked finder scope can give you an answer, though; if you know Polaris' position at the time you are looking for it, then the finder (even a Telrad) can give you a hint how close you are. IF the other parameters are correct! Level is not important for the polar positioning, just the first alignment star GOTO. The rest, though, (latitude, azimuth = 0, DEC = 90) are essential to setting or diagnosing the polar alignment.
Posted 10 May 2010 - 11:30 PM
Posted 11 May 2010 - 07:19 AM
It depends on how good your alignment is of course but after 2 align and 2 or 3 calib stars it should be good enough to see how much you need to move your mount.