Quote:
Originally Posted by toc
I am a bit frustrated - i can't get rid of my DEC backlash problems, so I might just not guide in DEC from now on. I tried last night to use the backlash compensation on the handset, but this caused PHD2 to go nuts during the calibration phase. Since the backlash seems dependant on what part of the sky I am imaging I am not sure how that would help anyway. I think I can mange it with balancing, but it is a big pain to have to redo the alignment to re-balance every time I want to image something on the other side of the sky. Btw I can tell the backlash issues are real because I can see phd sending many corrections in DEC before the mount moves. I have adjusted the backlash on the mount itself, but I haven't not been able to reduce it significantly.
Despite this I can occasionally get good results, almost always around the area of ETA carinae or the turancula nebula.
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Tim, out of curiosity, what is your tracking like without guiding? A correctly aligned CGX should be able to hold a target for a long time unguided. Are you running on the factory default settings or have you changed from them? I'd suggest going back to Nextstar default settings if you have moved off them, and testing again. Have you tried a target on the celestial equator, like the Horsehead, there should be very little DEC movement required there. Is your wedge altitude set correctly, have you checked that? I use Metaguide so I don't know much about PHD2. Do you have a place to specifiy the Declination of the target in the setup (Metaguide does)? Also do you have an aggressiveness setting for DEC? I'd ask why is PHD2 sending so many small DEC commands to the mount, or why the mount is ignoring them - sounds like a setting sensitivity issue. I know you asked about this topic on CN as well but there are no Southern Hemisphere CGX owners on CN other than us, but maybe that does not matter.
BTW I don't have your problem. Why not send a PM to Dylan and see if he can offer some advice, he has not been around here in awhile. Alternatively, get onto Celestron's forum and ask there.
If there is some setting you would like to compare with mine just let me know and I will check (but obviously not being a PHD2 user I can only advise on CGX settings).