David,
I just chose a random number -- 5. There was a thing I read, must have been the autodither plugin for CCDSoft, which goes into great detail about how much you should move the scope between exposures. Will have to dig it out and re-read it and implement the changes.
Rowland, you want to move the scope in a random direction after each exposure. Moving the scope in both RA and DEC is the best way to do this.
The plugin documentation mentioned above, recommended the spiral dither.
H
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