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Old 13-02-2007, 12:59 PM
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Garyh
Amongst the stars

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Join Date: Jun 2006
Location: Glen Innes, N.S.W.
Posts: 2,888
Thanks Mike, Duncan, Paul and Geoff...for the kind commets!!!!!
I would say with refractors it would be CA but with reflectors it would be defraction from the secondary obstruction..So the halo will show a similar color to the star while the refractor with some CA would show that blue/violet tinge halo...
By the way whats the GOD feature?
Cheers Gary
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