Good grief.
I just went and had a look at Keiths Image Stacker.
Sorry if I upset anyone (especially Keith) but it looks like a really crappy program, and he is charging for it!
Whereas there are many highly regarded stacking programs most of which are totally free.
Registax is about the most commonly used and is quite powerful.
Ivo, even the best of mounts will not keep an avi perfectly centred,
A stacking program needs to be able to lock onto a chosen point (or several points) to account for small mount errors and atmospherics (seeing, etc).
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