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hammerhead
professor emeritus
Reged: 02/18/07
Posts: 737
Loc: MA
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Quote:
Are you sure there will be that much of a difference between your 26T5 with focal reducer (60X) and an EP giving 50x?
Nope. Not sure at all. That's why I'm kinda fishing around for some guidance here on EP choices. I'm in the trial and error mode as this 11" SCT thing is brand new to me and I'm coming from using primarily 8" and 12" dobs for the majority of my viewing and that's what my current EP line-up was/is catered to. (How's that for a run-on sentence!) 
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-Brian
CPC 1100
Televue TV-85
WO Megrez 110ED
Televue Gibraltar with Sky Tour
31mmT5, 26mmT5, 20mmT5, 13Ethos, 10mmXW, 7mmXW, and 5mmXW
Oberwork 15X70, Coronado 10x25 Solar, Orion 7x50.
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coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 823
Loc: Montreal and St-Donat, Québec,...
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I think that with a 26T5, you are quite golden in terms of EP with your CPC. The Denk powerswitch should work fine but be aware that it is a 6.6 FR not a 6.3 (so giving you 63x instead of 60x).
New CPC1100, lucky you!
Have fun
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François
Nexstar 8 SE
50mm StellarVue finderscope, Astronomik UHC-E and Orion OIII filters
WO Swan 40mm; TV Pan 22mm; TV Nagler 9T6, 12T4, 17T4; TV Plossl 11mm and 15mm.
WO 2" dielectric diagonal retrofitted with Denk Power Switch (and now reach the zenith with the shorty adapter).
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Psyire
sage
Reged: 06/24/07
Posts: 353
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AFAIK, the maximum TFOV visible using a C11 is .94 deg using any 2" Eyepiece.
TFOV = (Eyepiece FS/Telescope Focal Length) X 57.3
(46mm / 2800mm) * 57.3 = .94 deg.
The 31T5 gives you .86 deg with an AFOV of 80 deg @ 90x mag. This is about as good as it gets for 'wide field' with the C11. You can sacrifice some AFOV for a slightly lower power if you wish, but you won't gain a whole bunch.
Eg. The 41 Panoptic will give you the whole .94 deg @ 68x mag but with the 68 deg AFOV limitation.
More than likely a focal reducer at these focal lengths may lower your magnification but you're field brightness will drop off very fast and you're probably going to detect vignetting around the edge.
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Celestron CPC 1100 XLT, Sky-Watcher Equinox 80ED
TV 31T5-Nagler, 8&13mm-Ethos
EarthWin Binoviewers w/ 24mm Panoptics
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