Thanks for the reply Ken, I was trying to compare a median stack to a Sigma average stack.
This was after reading Roger Clarks' ( Clarkvision) website where he proves a Sigma average stack brings out more faint detail than a median stack.
But my results appear to be identical and I think all I'm getting is a median stack each time.
Its not a big issue, I was just curious to see if my AA5 was faulty.
Thanks
Bill
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