Timo, point taken re; the effect upon seeing re; individual frames (exposures) within an avi. In these two images that i posted the differential (as reported by registax) was between 4 and 12 pixels. A good stack erases the comparatively massive movements, defocused frames and lighting variations one sees in the raw avi and leaves one with an image that is accurate to within the pixel error margin reported--basically the best, least "disturbed" frame of the avi but with sufficient "depth" to withstand post-processing without generating "too much" extraneous noise.
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Re: Gassendi and environs 16 May 2008
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