Gary I did a bit of a search on field rotation and came up the with this,
http://www.allaboutastro.com/Article...drotation.html
It appears to me that because I'm imaging saturn as only 21 degrees dec and pretty well on the meridian images pick up field rotation quicker than if I were shooting lower in altitude and further from the meridian. The offset of the rotation from the center of the image may be because my camera and telescope where not perfectly aligned with the center of the telescope view lining up with the center of the camera view (if you follow that). In fact that is the case as I was guiding on saturn with the Toucam (ie image is center in the scope) yet saturn is offset in the camera image.
Now of course this is a real bugger as I'm trying to track Flora and Herculian and they are only going to be this close to saturn for the next week or so
. I tried my eq mouned refractor but I was kidding myself if that thing was going to track effectively.
I guess if I really want this I'll have to take my wedge and do a bit of a trip to another site so I can see some stars suitable for drift aligning in the east or west. (I live in a bit of a bucket when it comes to seeing east and west. Don't you just love tall trees). maybe I can try iteration again with sigma octanis, that might get me close enough.
I'm going to look into getting a good 150 to 200 mm fixed lense. I have a reasonably good 2X teleconverter, but that particular purchase might have to wait for a while.
No more photos of this particular exercise, though if its fine tonight I might try again in ALT/AZ. Flora should be within the non- (well minimally) rotating section of the image.
I'll keep you "posted"
