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boblakewood
super member
Reged: 04/26/06
Posts: 169
Loc: Vlg of Lakewood IL
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All this talk of the 13mm Ethos has me wanting to spend some hard earned bucks. I currently have a 13mm Hyperion which is my favorite ep in my CPC1100.
Is buying a $600 ep for a slow F10 SCT a waste of money?
Edited by boblakewood (10/09/08 04:40 PM)
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coutleef
scholastic sledgehammer
Reged: 02/21/08
Posts: 806
Loc: Montreal and St-Donat, Québec,...
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Best way to answer that question is to try one at an astronomy club gathering.
The question you could ask yourself also, would you like better a 13mm or 17mm Ethos (supposed to be coming soon)?
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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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Joe Ogiba
Post Laureate
Reged: 02/14/02
Posts: 3340
Loc: NJ USA
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You could also use it with a F6.3 FR/FF.
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Pentax PF-80ED
Meade 102ED APO
Orion EON 72
120ST
Apex 127
C6 XLT
CR150
C9.25
XT10
Zeiss 7x42 FL
Canon 10x42L IS WP
15x50 IS
12x36 IS II
Garrett Optical 28x110 HD-WP Signature Series
Oberwerk BT-80 45
Apogee RA-88-SA
Denk II Power x Switch binoviewer w/13mm Ethos, 20mm Pentax XW's, 20mm Widescan III's.
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CHASLX200
professor emeritus
Reged: 09/29/07
Posts: 689
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13mm is a good mid range power for a 11" f10 SCT! I am sure the Ethos will give great views in that 11" on globs and other deepsky objects.
Chas
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jake47
sage
Reged: 03/03/04
Posts: 459
Loc: North Texas
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I don't have an Ethos for my NS11, but I don't see how it would be wasted. First there is the reported sharpness across the field. Second is the field itself. The only drawback to the SCT design that bothers me is the narrow field. 100 degrees makes medium high power with a decent field of view possible.
For instance. With the 6.3 reducer and the 13 Ethos, you would get a wider field at 135x (.74 degrees) than I get with my beloved and most used ep, a Panoptic 24. With it I get 117x w/0 the FR and just over 1/2 degree. I find that that range of power frames most the the objects I like well.
I have read that the long focal length scopes don't need the higher quality ep's. Not needing them and not showing a difference aren't the same thing. I see a difference in my f10 SCT between premium and good eps.
The last reason that the ep would not be a waste is that you never know what other scopes you might acquire. I started with the NS11 and now own four scopes, two are refractors which love my premium eps. If I ever get the 18 inch dob I crave, my eyepiece kit will fit it well. It might be nice to own an ep that you know will not be replaced. (That said, I too love my Stratus 17.)
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Jim in Texas
NS11GPS (Celeste)
C6S-GT (Celia)
SV 85S (Stella)
SV66 (Red)
Pentax Binoculars (the Twins)
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Tom Trusock
Reged: 02/26/02
Posts: 27299
Loc: Alternate Reality (TM)
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Quote:
All this talk of the 13mm Ethos has me wanting to spend some hard earned bucks. I currently have a 13mm Hyperion which is my favorite ep in my CPC1100.
Is buying a $600 ep for a slow F10 SCT a waste of money?
Personally, I would not recommend the 13 for an 11 SCT. The 17 would be a pretty decent match IMO. My favorite eyepiece in mine is my 17t4 nagler. The 13 is just too much power.
OTOH, if your 13 hyperion is currently your favorite... maybe your optics are better than mine or maybe you're using a RC. In that case, give it a try.
T
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RAKing
scholastic sledgehammer
Reged: 12/28/07
Posts: 803
Loc: Virginia
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I liked the 13mm Ethos in my old C11-A SCT - without the FR/FC. Maybe my skies and eyes are a little different.
Yes, it's fairly high power (215x) in that scope, but it still has a reasonable exit pupil, and you cannot beat the FOV at that magnification. It was a great Galaxy Hunter. 
I did not subscribe to the theory that you should sell off the 17T4 Nagler when you bought the 13mm Ethos. I think they worked together quite well and I used them both every night.
Ron
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Time spent looking at the stars is added to your life.
"Hi Def" TV-102
C925-CF SCT "Time Machine II"
Orion XT10i / Moonlite CR2
GM-8 GEM / A-P Portable Pier
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Barry C
super member
Reged: 04/15/08
Posts: 101
Loc: North Bend, WA
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I love the 13mm Ethos in my CPC 1100. I also tried the 8mm Ethos and found it to be too much magnification. The 13 is very usable, and I still use the 17T4 as well.
Barry
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CPC 1100 XLT
Moonlite Dual Rate Focuser
TV 2" Everbrite Diagonal
TV 41Pan, 22T4, 17T4, Ethos 13
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gladestar
member
Reged: 07/05/08
Posts: 77
Loc: Glade Park, Colorado
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The 13mm Ethos in my CPC1100 is absolutely stunning. I certainly do not consider it a waste, just the opposite. It gets used as much or more as any other EP in My EP case.
I might agree that the 8mm Ethos is a little too much magnification on many nights but even it is usable often enough I like having it (although it is used more in my other scopes.)
13mm Ethos in a CPC 1100 is sweet.
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Celestron CPC1100
Celestron NexStar8 SE
WO Megrez 90
TV Panoptic 35, 24
TV Nagler T5 16mm
TV Ethos 13, 8
Pentax XW 20, 14
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mikiek
scholastic sledgehammer
Reged: 10/10/07
Posts: 923
Loc: SE Texas
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I think a lot of it will have to do with your sky conditions. The 13mm works well when conditions permit, however where I observe that's maybe 50% of the time. The rest of the time the seeing just doesn't really support it.
So the question could be - do you mind having a $600+ EP that sits unused in your EP case half the time?
Some poster mentioned the 17mm. That might also be an option.
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___________________________________________________________
May there always be starlight on the path - R.Burnham
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Celestron CPC 1100
Radian 3mm, 5mm, 8mm, 12mm
Panoptic 22mm, 27mm, 35mm(the brick), 41mm (the cinder block)
Nagler 3-6 zoom, T4 17mm
Ethos 13mm
Everbrite Diagonal 2", Powermate 2X
FeatherTouch Crayford, Microfocuser
Telrad Finder, SV 9x50 RACI
Kendrick Dew System
TV NP-101(riding the CPC)
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