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Hi!

No, it is a slew in RA - I'm doing it with the same declination, just slewing in RA, to test. And right, no crossing the meridian. But physically, crossing the 90 degree azimuth line, the counterweight bar crosses to the other side of the mount - hence shift of side-of-pier, in a very literal sense.

Yes, it impacts my guiding since when the mount reports shift of side-of-pier, PHD2 swaps direction of RA guiding. But since no direction of the guidecam or otherwise in the mount has happended, this means that RA now escalates errors, rather than works against them - hence escalating run away scope.

In essence, PHD2 interprets shift of side-of-pier as a meridian flip. But this is not the only case when it occurs nor when the G2 reports it.

It took me quite a while to see this... And I guess this is not what would be problematic in regular AP, when you find a target, maybe calibrate, and then track for hours. Then there is a meridian flip, RA shifts, and back to tracking. It happens here because I slew from target to target, imaging 20-25 different targets with just one or two subs of each, but I need guiding because I do some 5 mins exposures and I get too much drift if no guiding. I have my complex sequence set up so it goes from lower altitude to higher, picking stars before they are too low, basically, and then waiting for some to rise some more (manually sorted). It means that it will start out on the west side, going in sort of zig-zag motion from RR Tau to GM Cam, to YY Aur, to U Gem and so on.

Do you see it now? Or what can I send or describe that makes it more clear?

Best,

Magnus