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Equipment Discussions >> Cats & Casses

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Lance1234
sage
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Reged: 11/01/12

Loc: SoCal
Favorite deep sky eyepiec focal length for C-9.25" new
      #6079203 - 09/13/13 06:34 PM

For those of you with 9.25" SCTs (or anyone else with a scope with around a 2350mm focal length), what's your most used eyepiece focal length for deep sky? I realize this is a simplistic approach to a complex subject and the real answer is probably several focal lengths, but if there is one that seems to end up in the focuser most often, what is it?

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titanio
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Reged: 02/15/09

Loc: Alicante, Spain
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: Lance1234]
      #6079230 - 09/13/13 06:55 PM

Hello

For me the best the panoptics 35

Toni


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germana1
professor emeritus
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Reged: 05/14/09

Loc: New Jersey
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: titanio]
      #6079269 - 09/13/13 07:22 PM

My fav is the 27 pan or if seeing permits 13 Ethos.
Pete


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Rick M.
super member


Reged: 03/16/13

Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: germana1]
      #6079335 - 09/13/13 08:07 PM

ES82 30mm or Ethos 13mm depending upon seeing.

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Lance1234
sage
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Reged: 11/01/12

Loc: SoCal
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: Rick M.]
      #6079368 - 09/13/13 08:27 PM

In both your cases, that's a pretty huge jump from 27mm/30mm down to 13mm. What is the deciding factor?

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RTLR 12
Post Laureate
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Reged: 12/04/08

Loc: The Great Pacific NorthWest
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: Lance1234]
      #6079385 - 09/13/13 08:37 PM

I have a C8 and my most used EP is my 17mm Ethos. I find that for most DSO targets I prefer the Mag and FOV of the 17. If I'm star hopping I'll use my 31 Nagler, but when I find something interesting I'll change to the 17 first and if seeing conditions and target allow maybe something with a bit more power.

Stan


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mark379
sage
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Reged: 02/07/09

Loc: New Jersey
Re: Favorite deep sky eyepiec focal length for C-9.25" [Re: RTLR 12]
      #6079488 - 09/13/13 09:57 PM

For deep sky widest field 31 Nagler.
For globs,etc. 11 or 14 ES 82...


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brianb11213
Postmaster
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Reged: 02/25/09

Loc: 55.215N 6.554W
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: mark379]
      #6079827 - 09/14/13 05:07 AM

For ANY scope, for deep sky objects, the one eyepiece I would not want to be without is one giving a reasonable field of view (60 deg is enough IMHO) with a 2mm exit pupil. For a f/10 SCT that's 20mm. I actually have several eyepieces with a focal length close to 20mm including a 20mm type 5 Nagler but the one that gets used most in my CPC1100 is a 20mm Meade "Super Plossl" (actually a 60 deg 5 element in 3 groups design) ... the reason being that the heavy 2" Nagler throws the tail-heavy scope even further out of balance. There is little difference the optical performance except that the Nagler has a noticeably wider appaernt field of view and a slight "warm" colour cast.

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Momerath
sage


Reged: 05/31/11

Loc: Upstate SC,
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: brianb11213]
      #6080308 - 09/14/13 12:26 PM

i love my es14mm

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Stelios
Carpal Tunnel
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Reged: 10/04/03

Loc: West Hills, CA
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: Lance1234]
      #6080434 - 09/14/13 01:41 PM

17mm Nagler. There's practically never a night when seeing affects it. And it's a perfect "window" into most objects.

The 13mm Nagler *can* be affected by seeing, and can't show as much. As for larger sizes (I have a 28mm UWAN and 40mm "cheapo") I find that I want more magnification, though all the mentioned eyepieces have their uses.

A 22mm Nagler might be ideal, but I don't have one (and don't really miss it). I have a *lot* of experience with the 9.25 which I've had for over 10 years, and 16-22 mm will be the "sweet" range for the viewing that 9.25 is good for (which is most anything *except* what calls for a wide field).

If I had to choose 3 EP's, it would be a 10, a 17 and something in the 28-35mm range. I probably would never need another.


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MrJones
Pooh-Bah
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Reged: 09/15/10

Loc: Indiana
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: Stelios]
      #6080548 - 09/14/13 02:46 PM

If I was going to pick a single EP it'd be the 24mm 68 degree Meade 5000. The current version of this is the ES 24mm and the Panoptic 24mm is very close also.

My most used at this point however is probably the 34mm 68 degree Meade 5000. It's good alone and with the f/6.3 focal reducer it gives a nice 1.6 deg TFOV at 43x.

I don't like the 82 degree as much as 68 degree.


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Brent Campbell
sage


Reged: 02/09/10

Loc: Olympia, WA
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: MrJones]
      #6080645 - 09/14/13 03:53 PM

On my C8 its my Meade SWA 40 MM! Cheap, maximum FOV, and suprisingly works very well in the C8.

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Lance1234
sage
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Reged: 11/01/12

Loc: SoCal
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: brianb11213]
      #6080711 - 09/14/13 04:26 PM

Quote:

For ANY scope, for deep sky objects, the one eyepiece I would not want to be without is one giving a reasonable field of view (60 deg is enough IMHO) with a 2mm exit pupil.



You're right about the 2mm exit pupil. From what I've read 2mm is supposed to be the optimum size for deep sky as you note. However, for whatever reason, I find that 20mm just doesn't give me as much magnification as I would like for many deep sky objects so that part is a quandary for me.


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mistyridge
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Reged: 10/28/05

Loc: Loomis, CA
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: Lance1234]
      #6081364 - 09/15/13 12:45 AM

31mm Nagler.

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David Knisely
Postmaster
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Reged: 04/19/04

Loc: southeastern Nebraska
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: Lance1234]
      #6081408 - 09/15/13 01:35 AM

Quote:

For those of you with 9.25" SCTs (or anyone else with a scope with around a 2350mm focal length), what's your most used eyepiece focal length for deep sky? I realize this is a simplistic approach to a complex subject and the real answer is probably several focal lengths, but if there is one that seems to end up in the focuser most often, what is it?




My two favorites are my 40 mm MK-70 Konig (59x, 1.12 degree TFOV), and my 14mm ES-100 eyepiece (169x, 35.5 arc minute TFOV). Clear skies to you.


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dragonslayer1
scholastic sledgehammer


Reged: 02/25/12

Loc: SLC, UT
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: David Knisely]
      #6081795 - 09/15/13 10:17 AM

I just use video cam now but when I did view I really likes the Explore Scientific. Very good E/P and good price,
Kasey


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iluxo
sage


Reged: 09/23/08

Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: dragonslayer1]
      #6082946 - 09/15/13 10:34 PM

In my f/15 Mak (2700 mm fl) my favourite eyepieces are a Vixen 50mm LV, and 13mm LVW. In your SCT these would be similarly effective, with a brighter image.

Edited by iluxo (09/15/13 10:36 PM)


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McUH
member


Reged: 05/29/13

Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: iluxo]
      #6084222 - 09/16/13 03:59 PM

If only one, I agree something in 16-24mm range, at least 68° FOV. But only as a compromise, I do not agree on some "2mm exit pupil magic". Every DSO has its own requirements.

For dim nebula or extended cluster 40mm-60mm for bright image and large FOV.
Around 20mm good for many Messiers, large (but not huge) clusters, galaxies.
Around 11mm or even less for weaker globulars (or to really resolve M13), compact clusters, planetary nebulae etc.


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WesC
Carpal Tunnel
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Reged: 02/06/13

Loc: La Crescenta, CA
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: McUH]
      #6084436 - 09/16/13 06:02 PM

31mm Nagler/30mm ES82, 20mm ES100, 11mm Nagler T6. I'm considering adding either a 13mm Ethos or a 14mm ES100.

This is with my Edge 11, but they should work great with the 9.25 as well.


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Dave Lee
sage


Reged: 02/14/13

Loc: Pinehurst, NC USA
Re: Favorite deep sky eyepiec focal length for C-9.25" new [Re: WesC]
      #6084493 - 09/16/13 06:39 PM

For me the most used EP is an old Meade 56mm plossl (1990's incarnation of a C11). It gives me the biggest FOV available in a 2 inch format, and works well when 'finding stuff' (I am a star hopper).

For actual observing I find that my ES 18mm (82* FOV) is the most frequently used followed by a UO 32mm Erfle and occasionally a ES 14mm (and rarely an old 9.7mm Plossl).

One nice thing about f10 scopes is that less expensive EP's work reasonably well.

dave


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