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GeorgeNC
professor emeritus
Reged: 03/26/07
Posts: 826
Loc: Land of the Sky, North Carolin...
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What a sight! Was causually observing last night (no particular target in mind, but the skies were too pretty not to set up the 10" LX90 and look around). Was observing a few double stars with the 25mm W.O. Swan - Albireo was beautiful as usual. Then had some problems splitting a couple of close doubles (Delta Serpentis in particular) so I switched to the 17mm T4 Nagler - got a nice split with that ep. Stayed in Serpens, and tried to split STT-360, which has a separation of 1.5" - so I changed eyepieces again, and used the 12mm T4 Nagler, bringing the magnification to a little over 200x - still not able to split, so moved to a few deep sky objects. M-81 and M-82 came through very clearly, even in my slightly light polluted skies. Swung over to M-13.
Wow! What a sight, just about fills the fov at 200x. Clear like some of the really good images you see of that cluster. Stayed on that awhile, then shut it down - didn't think anything else would compare the rest of the night.
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Meade 10" LX90 OTA mounted on CGE
Stellarvue 80mm Nighthawk II
Celestron CG-5
Canon 40D (unmodded)
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Illinois
professor emeritus
Reged: 12/18/06
Posts: 557
Loc: near Chicago, Illinois USA
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Great! When the night is right and high power is useful!
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Astronomer since 1975!
Meade 16" Lightbridge Dobsonian
Orion 10" SkyQuest Classic Dobsonian
Tele Vue Eyepieces
Orion Expanse Wide-Field 6mm eyepiece
4.5" F5 Reflector since 1982!
Orion Narrowband and SkyGlow filters
Member of IDA, let's fight light pollution!
Old Edmund 6"F8...donated to cousins
Super Polaris C8...donated to Byron Observatory in Illinois
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bicparker
Pooh-Bah
Reged: 02/07/05
Posts: 1438
Loc: Plano, TX
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I always like globs at medium to high magnifications (i.e., 170x-500x++). You really get to appreciate the granularity and other details starting at around 170-250x.
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Bic Parker
17.5" f/5 dob
10" f/10 SCT
5" f/8 refractor
80mm f/6 refractor
66mm f/6 refractor
Plus a few others out of the rotation
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JakeT93
member
Reged: 06/28/08
Posts: 177
Loc: Williamstown, NJ
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I like M13 at around 90x. At 45.6x in my 25mm Meade, I like how it's near those two stars. At 130x it looks nice as well, but at 228x, just a bit hard to focus! I use the red star as my focus star, then move the scope back where M13 is. I kinda like M13 with Medium power ( 65x-130x ), but M92, I use MORE POWER! 
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-Jake the Snake
My equipment:
Orion DSE 10" Light Bucket!
10x50 Finder and ebay bracket
40mm GSO Plossl
32mm Celestron Plossl
2x Antares Barlow
25mm and 6.7mm Meade 3000 Plossls
Orion Explorer II 10mm and 17mm Kellners
Orion SkyGlow Ultrablock
Antares ND25
70 M's Obsreved
All Planets seen
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lymorkiew45
sage
Reged: 12/30/07
Posts: 323
Loc: Anaheim
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M13 is my favorite globular cluster, I've used powers up to 600*, and it still looks great through my 12" dob, this globular really has a beauty to it, particularly under a dark sky...clear skies... 
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Control Yourself, let others do as they will, this does not mean you are weak, control your heart, obey the principles of life, this does not mean others are stronger. *Lung Ying Mor Kiew motto*
Starfinder 16 EQ, and dob
DS-10
Orion XT 12i
Z12
All the Lanthanum superwides!
Orion ultrablock filter
9mm Nagler type 6
15mm, 25mm, 35mm Ultrascopics
Orion Shorty Plus barlow
Orion Lazer Colimator
30" dob planned out in far future!
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desertrefugee
professor emeritus
Reged: 08/06/07
Posts: 527
Loc: Arizona
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I've logged lots of observations of M13 but, for me, using 8" of aperture is where it starts to really be resolved. And, in my opinion, begins to be seriously interesting above 120X or so.
YMMV and other globs respond differently.
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"Look now upon the River of Heaven, Sky-Road of the Immortals, White with the star-frost of a billion years".
+++
-Darrell
Reflectors (114, 150, 254mm), Refractors (60, 76.2, 80, 120), MCT (125), way too many Binoculars
Cave Creek/Carefree, AZ
Edited by desertrefugee (07/03/08 10:52 PM)
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RussL
Music Maker
Reged: 03/18/08
Posts: 1608
Loc: Cayce, SC
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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? 
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--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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Mr Q
sage
Reged: 02/25/08
Posts: 351
Loc: N Central New Mexico
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At moderate high powers, in my 10" newt, a few streamers of stars can be seen meeting at the core - appearing similar to a propeller. Some say the effect is the same but with dark lanes. The whole effect may be a trick of the mind but it's a nice illusion. Yes, M13 is the northern sky showpiece but compared to Omega Centauri, it pales in observing beauty. Even at 10 degrees above my southern horizon, its beauty is awesome. Mr Q
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What goes around, comes around, eventually.
Meade DS-10(10" newt)
10x50, 10x70 binos
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Olivier Biot
Amused
Reged: 04/25/05
Posts: 14328
Loc: 51°N (Belgium)
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Probably M13 is so popular because it is so easy to find. Personally I tend to favor M3.
Now if you speak of southern hemisphere globulars, I really love ω Centauri as well as 47 Tucanae. Too bad they're way below horizon for me, since I live at 51°N.
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Tal-200K (#199) with JMI NGF-Mini2M focuser on GEM3 • Astro-Tech AT80ED on Orion Sirius EQ-G with EQDIR & home made wireless EQDIRECT • Celestron Regal LX 8x42 & 10x42 • Helios 15x70
ATM 14" f/5 (designing mirror cell and filter wheel/focuser) • ATM 10" f/6 Portable Truss (polishing) • ATM 10" f/25 Dall-Kirkham (primary: polishing, secondary: #120 grit)
AstroForecast
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Paul_R
Carpal Tunnel
Reged: 04/05/05
Posts: 1648
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A good reminder to try all sorts of magnifications to bring out the best in a DSO.
M13 really shines in larger aperture (10"+) and can take higher power. In a 7", however, I don't go much over 130x, and prefer 70x-100x.
While M13 is amazing, in smaller scopes, I prefer M22. It resolves better and gains by being set amidst all those glorious summer Milky Way objects that can be swept up so easily.
I'll make a pitch for the low power view, too. For most globulars, regardless of aperture, the lower power, less resolved view is less fatiguing, and with the ball of stars set in a larger sky context with field stars, can give an aesthetically more pleasing view!
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