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Which LER 10mm or 12mm for binoviewing?

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#1 Ohmless

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Posted 03 November 2019 - 01:12 AM

The only LER 10mm I am aware of is the Radian, but they are pricey($170 each roughly) and I have read that they are mediocre at best.  With this focal length being solely for planetary I want reliable performance.

 

The lead contender for the 12mm slot is the HD-60.  I have had a 12mm Paradigm in the past that I used cyclops style but sold it as the eye relief was barely tight enough to not be comfortable with my glasses on(my preferred way as I have astigmatism in both eyes).  Loved that eyepiece otherwise.

 

I also would rather have eyepiece pairs than have another barlow.  My collection has always been very spartan, but lately want to get a bigger EP collection.  As you can tell my current eyepieces I don't need or care for wide field eyepieces.  Performance and price are my main factors in selection.

 

 

Here are my current lineup with their binoviewing magnifications:

25mm hd ortho (61x and 107x)

15mm Paradigm (102x and 178x)

 

Prospective eyepieces:

12mm would provide 127x and 222x            < I think this is the better focal length to get first.(highest mag used last Mars opposition)

10mm would provide 150x and 262x            < Eventually want to get this for rare max magnification use like favorable Mars oppositions.

 

This is in a 6" f/5(750mm) with a 2x WO OCA and a barlow with an effective 3.5x. 

 

Also as a refresher, the last Mars opposition had a low altitude and a worldwide dust storm that ruined contrast.

 

 

 

Thanks for talking bino pairs with me!

Kelly


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#2 Kutno

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Posted 03 November 2019 - 07:53 AM

Radians, mediocre?  That's a canard.  They are wonderful in F/5s.


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#3 noisejammer

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Posted 03 November 2019 - 09:22 AM

I have 8mm & 12mm pairs of Radians - they are excellent (if you can find them.) Yes, they do have a warm tone but my all-time best view of Jupiter was through a Radian. The obvious modern alternative is the Delite (available in 9, 11 & 13mm).

 

IF - and really only if - you are using the Baader MkV binoviewer and have a 3" or larger focuser, the 10mm Delos is a superb eyepiece. I have a pair and these are my go-to eyepieces for a lot of my viewing.

 

Less expensive options - I'd say you could browse Don's list that's posted as a sticky at the top of the eyepiece forum. Bottom line though, the three I've mentioned will be among the best available.


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#4 25585

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Posted 03 November 2019 - 03:27 PM

TV Delite 11mm, Pentax XW 10mm, Nikon NAV SW 10mm or Baader Morpheus 9mm.

 

 

Celestron - Omni XLT 127 - Tele Vue - Delite - 11mm
Scope: 127mm / 1250mm EP: 11mm / 62° Barlow/Reducer: NoneExit Pupil: 1.12mmMagnification: 114x

Celestron - Omni XLT 127 - Pentax - XW - 10mm
Scope: 127mm / 1250mm EP: 10mm / 70° Barlow/Reducer: NoneExit Pupil: 1.02mmMagnification: 125x

Celestron - Omni XLT 127 - Baader Planetarium - Morpheus - 9mm
Scope: 127mm / 1250mm EP: 9mm / 76° Barlow/Reducer: NoneExit Pupil: 0.91mmMagnification: 139x

Attached Thumbnails

  • astronomy_tools_fov (67).png

Edited by 25585, 03 November 2019 - 03:35 PM.


#5 Ohmless

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Posted 03 November 2019 - 03:52 PM

I think I should have made it more clear in my original post.  The most I can afford to spend for each pair is $200.  I might be able to stretch that to $250 if I am lucky.

 

I also got down to doing more math and think I should go with a pair of 9mm Xcel LX that would provide 166.7x with the 2x WO OCA instead of a 10mm pair.  Before that purchase, I still would want a 12mm pair that will have two useable magnifications.



#6 25585

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Posted 03 November 2019 - 03:57 PM

Vixen SLVs which just go over your budget, they are reduced to $109 each. https://www.eyepiece...5_p/8104100.htm


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#7 Usquebae

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Posted 08 November 2019 - 12:03 PM

Vixen SLVs which just go over your budget, they are reduced to $109 each. https://www.eyepiece...5_p/8104100.htm

I have the 10mm SLV, and previously owned the 4mm.  I really like them:  very comfortable with glasses or without, and I find them to be very sharp with clean fields, and... drumroll... SMOOTH BARRELS! scared.gif

 

The one problem with SLVs is they have a light control issue due to a shiny internal retaining ring.  This plagued lunar views to me, so I sold the 4mm that I only planned to use on the Moon.  The ghosting reflections on planets are subtle and do not bother me; I have not noticed any ghosting on deep sky.  So, I remain happy with the 10mm for planets, and when I want a restricted deep sky FoV.  Conveniently (and oddly), the SLVs are available in 9mm, 10mm, and 12mm - so lots of options for the OP's purposes. 

 

I've enjoyed planetary views enough with the 10mm that I'm considering buying a second for BV use, even though I have two 18.2 DeLites I can barlow.  For the OP, adding additional barlows to your arsenal is also an option if you really like the longer focal lengths you already have.  I have a few Siebert barlow elements that I use with my binoviewer.


Edited by Usquebae, 08 November 2019 - 12:09 PM.

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