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John K
scholastic sledgehammer
Reged: 12/26/05
Posts: 797
Loc: Vernon BC Canada
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Cost not an issue and you would be using it in a 15 f5 scope what would you buy? 31 Nagler or 35 Pan? 
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RASC Member (Okanagan)
Home built 15"F5 Obsession clone
Bushnell 76mm Modified Dob (Little Richie)
Celestron Skymaster 15x70
Howie Glatter laser pointer/Blug
Astronomik filters OIII UHC
Televue Eyepieces 31mmNagler,32mmPL,15mmPL,13mm Ethos,11mm PL,2X Barlow
10mm Speers Waler
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csa/montana
Wild Spirit
Reged: 05/14/05
Posts: 40185
Loc: montana
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I have a 16" F4.5. I have a 31 Nagler on loan, & own the 35Pan. At first I was a little overwhelmed with the view thru the 31 Nagler; but as I use it, I find it rather constricting to then view thru the 35Pan.
I will say however, the 35Pan is an exceptional eyepiece.
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Carol
AstroTech 16" Dob (Thanks ASTRONOMICS!)
Vixen 80MF/AstroTech Voyager
Masuyama's 7.5, 15, 25W, 35mm,
Pentaxes; 5XW, 7XL, 10XW.
14mm Meade 4000 UWA
TV Panoptics; 22, 35
DreamCatcher Dobservatory, #2
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Eddgie
Carpal Tunnel
Reged: 02/01/06
Posts: 2701
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This is a very difficult question.
I have recently moved from my 31mm Nagler to a 41mm Panoptic in my C14 because I felt that the lower magnification of the 41mm would help suppress the coma in the telescope.
Since, I have gone to Panoptics for the C14 down to 19mm, and beyond that, I use Naglers becuase at that point, I can tolerate the coma much better.
The 31mm Nagler has a wider true field than the 35mm Panoptic, and as a result, you are seein an area of the field that has more comatic abberation present.
The 35mm is cutting off that area of extreme coma, so the field is bit smaller, but almost just as importantly, the coma visible at the field stop is less magnified, so the comatic blur is a bit tighter.
Now, in side by side comparisons between the 31mm Nagler and the 35mm Pan in a scope that is coma free and has a flat field, both of these eyepieces will provide literal pinpoints at the field stop. Neither is better than the other in terms of off axis sharpness at f/8. I expect that they would be similar at f/5 in a flat field coma free telesope, though I think at f/5.4 I can ses some astigmatism in the 31mm when uses in my TV 101, but it is very possible that it is coming from the scope itself.
Anyway, if you think coma may be an issue, it MIGHT be that the 35mm Pan is a better choice. If you are not sensitive to coma, then the 31mm Nagler is perhaps the greatest long focal lenght eyepiece availble (in my own opinion anyway).
So, to answer your question, if it were me, I would probably go with the 35mm Pan. Since getting the 41mm Pan, I no longer use the 31mm in my C14, but I hardly ever take it out of my 6" f/8 refractor. OMG it is magnificent in that scope.
Regards.
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Celestron C14, CGE (Big Al)
Astro-Physics 6" f/8 (Buffy)
Televue 101 (No name, but I call it my Widescreen HD Space TV)
The night sky is my mistress. She seduces me away from all other lovers.
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Jeronimo Cruz
super member
Reged: 09/01/08
Posts: 141
Loc: Tucson, AZ
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With Dobs it's all about getting the largest TFOV possible. In that respect, the 31mm Nagler delivers. I use one regularly and it's one of my favorites. It's very comfortable to use. Great performer, too. I'd suggest a Parracor though. Good luck!
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Jeronimo
TeleVue 101 + Gibralter
Celestron NS11 GPS/wedge + Hyperstar
Photon Instruments 127mm + SV F50W2
Lunt Solar Systems LS60DS Ha + Celestron CG-5
Naglers, Panoptics, Radians, Nikon binoviewer
Fujinon 10x70 FMT-SX, 7x42 CD; Canon 15x50IS;
Pentax 7x50 PCF WP, 10x50 PCF WPII, 10x50 DCF SP
Work
20" R/C RCOS on Paramount + Tak FSQ
16" R/C RCOS on Paramount + TEC 140
16" Meade LX200 SCT + TV 76
Ethos, Naglers, Panoptics
Coronado Solarmax 90mm Ha
Coronado Solarmax 70mm Ca
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Bowmoreman
Post Laureate
Reged: 09/11/06
Posts: 3989
Loc: Bolton, MA
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My thoughts: having owned both (I kept the 31T5):
1) If coma is an issue, get thee a Paracorr...
2) If coma bothers you, it is going to bother you about the same with EITHER the 31T5 or the 35Pan anways
3) Just get the 31T5, you know you want it... 
Note: the above experiences were in my 10" f4.7 Newt... I never compared the 31T5 and the 35Pan in my 8" f4.0 Newt, or my 11" C11... For those scopes, I've only had the 31T5... which is NEVER going away... it is a truly awesome EP!
clear enough skies
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Dave
Imaging: MI-250+ADM/SBS/Optec Libra: C11Hyperstar,TMB80SS
Visual: XT10i RTP
TV: 31T5,22T4,17T4,12T4,13Ethos,8Ethos;2x Powermate,Paracorr, 1.6X Antares, Hyperion8-24Zoom
Cameras: Mallincam Color Hyper Plus, QHY8
Guider: SBIG STV eFinder
Key Add-ons: Gerbings Heated clothes, WilderSkiesObservatory(BYO#90), Speco 9"Monitor
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Tigerider
Vendor (Televue Rep)
Reged: 02/21/06
Posts: 305
Loc: Torrance, CA.
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John,
The 35 Panoptic has a 38.7mm Field Stop giving a 1900 mm scope about
1.17 degree FOV, the 21 Ethos has a 36.2 Field Stop giving a 1.09 FOV !!!
magnification difference: 54X for the 35 Pan & 90X for the 21 Ethos and almost the same FOV.
sorry for the wrench, I had too... 
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John Rhodes (TV Rep.)
TeleVue: NP 127is,101is,101
102,85,76,60is,60 all EP's+
Flat Field Imaging from F/4.2 - F/8.1
360mm - 990mm Focal Lengths
Celestron CGE mount
Celestron Ultima 11 & C-5
Meade Research Grade 856 (1970's)
Celestron 20 x 80
Canon 20 Da {*;*} DSLR
Canon "is" Binoculars: 10x30 & 15x50
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John K
scholastic sledgehammer
Reged: 12/26/05
Posts: 797
Loc: Vernon BC Canada
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 ya know ya want it   
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RASC Member (Okanagan)
Home built 15"F5 Obsession clone
Bushnell 76mm Modified Dob (Little Richie)
Celestron Skymaster 15x70
Howie Glatter laser pointer/Blug
Astronomik filters OIII UHC
Televue Eyepieces 31mmNagler,32mmPL,15mmPL,13mm Ethos,11mm PL,2X Barlow
10mm Speers Waler
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John K
scholastic sledgehammer
Reged: 12/26/05
Posts: 797
Loc: Vernon BC Canada
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Hi John
What would the exit pupil be.Would I loose to much when I use a O-III filter?
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RASC Member (Okanagan)
Home built 15"F5 Obsession clone
Bushnell 76mm Modified Dob (Little Richie)
Celestron Skymaster 15x70
Howie Glatter laser pointer/Blug
Astronomik filters OIII UHC
Televue Eyepieces 31mmNagler,32mmPL,15mmPL,13mm Ethos,11mm PL,2X Barlow
10mm Speers Waler
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Tigerider
Vendor (Televue Rep)
Reged: 02/21/06
Posts: 305
Loc: Torrance, CA.
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Quote:
Hi John
What would the exit pupil be.Would I loose to much when I use a O-III filter?
You still have a 4 mm exit pupil, and the darker background sky from the increased magnification would help a lot.
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John Rhodes (TV Rep.)
TeleVue: NP 127is,101is,101
102,85,76,60is,60 all EP's+
Flat Field Imaging from F/4.2 - F/8.1
360mm - 990mm Focal Lengths
Celestron CGE mount
Celestron Ultima 11 & C-5
Meade Research Grade 856 (1970's)
Celestron 20 x 80
Canon 20 Da {*;*} DSLR
Canon "is" Binoculars: 10x30 & 15x50
Edited by Tigerider (11/06/09 04:17 PM)
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cuzimthedad
Just Be Cuz
Reged: 04/09/06
Posts: 3718
Loc: Sonoma, Northern California
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The 31T5 is an awesome ep in my 20" f/5. I don't need a parracor either.
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Dan
20" f/5 Obsession
Antares 1529
TV102
Various Naglers, Ethos, UO Orthos and TV Plossls
The Off Fisher Lane Irregulars
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John K
scholastic sledgehammer
Reged: 12/26/05
Posts: 797
Loc: Vernon BC Canada
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Yep I'm Going to order the 31 Nagler now and the 13 Ethos.The Ethos was a no brainer for me. I had a full night at a dark sky mag 7+ That sealed it for me and the 13 ethos.
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RASC Member (Okanagan)
Home built 15"F5 Obsession clone
Bushnell 76mm Modified Dob (Little Richie)
Celestron Skymaster 15x70
Howie Glatter laser pointer/Blug
Astronomik filters OIII UHC
Televue Eyepieces 31mmNagler,32mmPL,15mmPL,13mm Ethos,11mm PL,2X Barlow
10mm Speers Waler
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Eddgie
Carpal Tunnel
Reged: 02/01/06
Posts: 2701
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Ah, but when you use the Paracorr, you RAISE the magnification, so the reality is that the TRUE field in the 31mm Nagler is about the same as when using the 35mm Pan, and maybe even a bit smaller.
Always a tradeoff..
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Celestron C14, CGE (Big Al)
Astro-Physics 6" f/8 (Buffy)
Televue 101 (No name, but I call it my Widescreen HD Space TV)
The night sky is my mistress. She seduces me away from all other lovers.
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gaz-in
sage
Reged: 12/17/07
Posts: 441
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Good call...I just replaced a 35 Pan with a 31 Nagler...The 35 Pan is an Excellent Eyepiece....the 31 Nagle is simply amazing...
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John K
scholastic sledgehammer
Reged: 12/26/05
Posts: 797
Loc: Vernon BC Canada
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Gaz-in What scope do you use it in?
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RASC Member (Okanagan)
Home built 15"F5 Obsession clone
Bushnell 76mm Modified Dob (Little Richie)
Celestron Skymaster 15x70
Howie Glatter laser pointer/Blug
Astronomik filters OIII UHC
Televue Eyepieces 31mmNagler,32mmPL,15mmPL,13mm Ethos,11mm PL,2X Barlow
10mm Speers Waler
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gaz-in
sage
Reged: 12/17/07
Posts: 441
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A discovery 8" F6 Dob...
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