I mounted the Toucam with a 6-60mm zoom lens on top of my guidescope and the mount was tracking like usual, and I was imaging Carina Region, but I got field rotation??????
This image is a stack of 12 x 60 second images and shows the rotation.
a. Your camera slipped
b. Your scope moved
c. Your drive was fast/slow
d. The stars moved more quickly than usual due to an Einsteinian bubble lensed via the dark matter in the nebula (I made that up).
Interesting that the rotation isn't centered on the center of your image. How far was the guidestar you were using from the area you were trying to image?
Nope, it is permanently set, and images through the scope were unaffected.
Quote:
Originally Posted by [1ponders
] Interesting that the rotation isn't centered on the center of your image. How far was the guidestar you were using from the area you were trying to image?
That is because the 'centroid' star is the one I chose to stack on.
I didn't use guiding on these images.
If you weren't guiding then having your scope optics and your camera optics shouldn't matter. That was the point I was getting to before. If you are guiding away from the area you are imaging then it is possible to still get field rotation. But if you were not guiding then it shouldn't matter where your telescope points and where your piggybacked camera points.
It is a bit strange. What program are you using to stack with? Can you use two or more alignment points? The only thing I can think of is that your tracking rate may have been a bit off and you are getting successive images slightly ahead or behind the previous ones. You weren't set on solar or luna rate on your mount were you?
It is a bit strange. What program are you using to stack with? Can you use two or more alignment points? The only thing I can think of is that your tracking rate may have been a bit off and you are getting successive images slightly ahead or behind the previous ones. You weren't set on solar or luna rate on your mount were you?
Registax 3, Paul. I'll give it a go in Regi 4 using multi-point. Tracking was perfect. Images through the scope are spot on. Set at Sidereal.
Here's 8 of the 12 (all that will fit in here) for you to play with. Unfortunately, to get them in here they have been reduced in size and converted to JPEG's.
Obviously they look like rubbish at this Pre-Processing point.
I had exactly the same problem when I tried to use a ToUcam and camera lens combo piggy backed on my scope. The exposure was short enough not to show appreciable trailing in the frames, but each frame was rotated, and so Registax wouldn't stack properly.
Of course, mine could've been due to poor polar alignment, being a portable setup, but I thought I had it pretty good on the night and ended up putting git down to the lens not being parallel to the OTA, but I can't logically see why this should be...
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All I got was Multi-rotation!!! 
