hermperez@... wrote:
If you rotate the images prior to stacking, then you can cancel out field
rotation (obviously some of the rotation, not all)...in other words, you do x-y
adjustments on your images to stack, but if you also do a rotation of one of the
images then field rotation is canceled.
I can stack two 90 min exposures, there is noticeable rotation on one of the
images to make them align. Picture Window Pro will do this kind of alignment.
Herm
That's a good point Herm. Someone could take shorter exposures,
de-rotate, and register them if they needed to during image processing
as long as no one image smeared.
A friend of a friend of mine was supposed to have been experimenting
with shooting through an alt-az arrangment doing this with very short
integrations.
take care,
Rockett Crawford
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Capella's Observatory (CCD Imaging)
