[PRejto (Peter)]

I'm still fighting with some strange issues re declination whilst guiding. I've got a thread over at SB that has bogged down a bit but I'm still hopeful about some feedback.

In a nutshell guiding will start off quite well. I wil go perhaps several minutes with very tight guiding. Abruptly I will get excursions in declination that go uncorrected for perhaps a minute or more, then followed by good guiding. Then the problem may pop up again but now on the other side of the Y axis where things just seem to get stuck for a while. I've got the guide camera aligned so RA=X. Aggression is set to "4" which gives a very good result in RA. When I increase aggression guiding is not as good in RA but may improve in declination. I'm unsure if there is a way to increase aggression in just one axis. But, what seems more odd is that decination would even get stuck on the "other" side of "Y." Drift ought to only be in one direction.

I have adjusted the cam stop in declination.
I have excellent polar alignment (Ma=6.1, ME=84.1 or 2 arcsec from refracted pole).
I get same results with ProTrack on or off.
Balance is spot on, and I cannot detect anything loose on the mount or cameras.
PEC on (error is below 1 arcsec)

EDIT: I'm using the Camera Add On in TSX to guide with Direct Guide. Also, the double spike is because I'm guiding through an ONAG in the infra red. I'm assured the guide problem is not due to the double spike but is due to IR passing through a typical APO. As pointed out by Josh below if the problem was the ONAG I would be seeing the problem in RA as well.

Any ideas would be much appreciated!

With ProTrack off, given my polar alignment, how long should I be able to track in Y without significant drift? (guide camera is imaging at 3.12 arcsec- binning 2x2).

Thanks,

Peter