Quote:
Originally Posted by g__day
I'd try up the Hysteresis from 10 to 20 and see if that improves things.
Secondly once you've optimised Hysteresis try varying the minimum move before guide command issued between 0.1 - 0.8 in say 0.05 increments to see what works best for you. You could be chasing the seeing!
|
Thank you, I'll give Hysteresis a shot
Quote:
Originally Posted by multiweb
Everytime I got a low (<0.2) or high (>0.5) OSC I was guiding close to the celestial equator. 90% of the time it was a balance issue (west too heavy or too well balanced with high backlash in RA) or poor polar alignment. The rest 10% was the agressiveness in PHD. Lowering it to 60% smoothed things up. Seeing can make your guiding turn to .... real quick too, so something to consider. Bad seeing, longer guider exp. (2-3s). Normally 1s works nicely for me in good seeing. Your RMS is very good though. I typically get 0.3-0.4. May be because I dither and bump the mount all the time though.
To improve your OSC. Be east heavy all the time, get your polar alignment spot-on so you hardly correct in DEC, guide every 1-2s minimum. Pick a bright enough guide star. I found picking the right star makes a hell of a difference. Not too bright but not to dim either. Problem is that PHD will guide on really faint stars too, but the guiding IMO is not as good?
|
Good points, thank you, will give balancing more to the east and Hysteresis a shot.
I take it the whole idea of the graph is to flat line it as much as possible.
Cheers
Eddie