Quote:
Originally Posted by PaulSthcoast
O.K......
I'm sure I am not alone in wondering.....
So, for the likes of myself and others;
What is FWHM ?
Paul.
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Hi there Paul
The Full Width Half Maximum (FWHM) is a measure of the quality of an astronomical image based on how much the telescope and atmosphere have smeared a point source (stars) in an image, over several pixels in the CCD. Simply put, it describes how much a point of light spreads out due to the bluring effects of our atmosphere. At the very best sites in the World, this spread is under 1 arc sec, in Australia anything under 2" is generally considered the Holy Grail
Mike