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Old 08-08-2011, 04:11 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,927
Double Double in Lyra

I see this gets mentioned in the latest Aust. S&T (p50)
I was recently testing some 2" diagonals and had the chance to observe the double double with the ol' 4" Genesis and the TV plossls.
At x78 it showed easy separation and perfect Airy disks for each star...I though it would be interesting to see what the minimum magnification would be to still separate the stars.
It turned out that all I needed was x48 (a 10.4mm TV plossl) - the black dividing line between the stars was definately seen and held.
Not bad for a BoF, a 25 year old scope (and eyepiece) and average seeing from the lowlands of Belgium.
I'd be interested in hearing from others similar "low magnification" double star experiences.
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