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RussL
Music Maker
Reged: 03/18/08
Posts: 1715
Loc: Cayce, SC
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Re: M-13 at 200x magnification
07/03/08 11:06 PM
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I started getting really good granularity at around 162x in my 8" SCT. I took it all the way to 580x, and although that's way beyond my theoretical highest useful power, it was a breathtaking sight, almost scary, for not only was it BIG, but I was inside it. I couldn't even see the whole thing. Lots of individual stars were visible (although not pinpoint sharp at that power). Probably the best high power view came at 320x, but even at 162x it was grainy and brighter. I think the only globular I could love better than M13 would be Omega Centauri---if ever I could see it. Glad to hear you got such great views of M13. It's a monster, ain't it? 
--------------------
--Russell
"Akita mani yo." Observe everything as you walk. (--Lakota)
Celestron Celestar 8 Standard SCT, f10
Celestron 80mm Wide View ref., f5
Criterion RV-6 Dynascope, Newt., f8, (c. 1962)
Sears Discoverer 60mm ref., f7, (c. 1973)
Celestron Ultima DX 10x50, 6.5 TFOV
Tasco 7x35 wide
Several mediocre eyepieces
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