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What makes a good binoviewing eyepiece?

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35 replies to this topic

#26 rob.0919


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Posted 23 September 2019 - 06:53 AM

24mm Panoptics.

The best pairs for bino-viewing i've used.

They tick all the boxes.

#27 25585


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Posted 26 September 2019 - 07:17 AM

My equivalent to 24 Panoptics are 28mm Takahashi Erfles 60°  https://www.firstlig...piece-28mm.html No undercut, better usable eye relief than LE30s, same TFOV as the 24 Pans. 

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#28 Charlie_van


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Posted 26 September 2019 - 09:16 PM

I used Nikon CFI 10x/22 microscope eyepiece. The CFI series eyepiece is for Nikon Infinity Optical System, high-end microscope.

It's high point and providing incredible high contrast. Very comfortable for me.

#29 Derwin Skotch

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Posted 07 October 2019 - 05:54 PM

I have several pair including 30mm Celestron Ultimas, 24mm 68 degree Explore Scientifics, 15mm Celestron Axioms, etc but the most comfortable I have are a pair of old 20mm Meade Research Grade wide angles. They are not as sharp at the edge as some of the others but they are light (aluminum construction), compact and VERY easy to look into.

#30 Tom Masterson

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Posted 08 October 2019 - 09:10 PM

Light weight eyepieces are important in my set-up especially if I have my binoviewer at an angle in the diagonal. Don't need to crank the focuser locking screw down as hard. I like longer eye relief eyepieces so I don't have to touch them while viewing. It's just more comfortable for me. I don't mind my face touching in monoview, but for some reason looking "into" two eyepieces without touching them is what I prefer when I binoview.


Since I primarily use the binoviewer on the planets, Moon, Sun and double stars, a large apparent field isn't needed so I've stuck with budget eyepieces. In the longer focal lengths - 32mm and 25mm I use GSO/Orion Plossls, in the mid range, I use 20mm Superviews , 14mm Antares W70s,  in 12mm and 9mm, Zhumell LER planetaries and @6.5mm, Meade HDs.


Now, to give full disclosure, my budget had a strong influence in my choices. I couldn't bring myself to spend more on a pair of premium eyepieces. I started off with the Plossls because picking up a mate for one I already had cost only $20. The W70s are probably the tiniest eyepieces I've ever owned so are perfect in the binoviewer, the HDs are surprisingly light weight.

#31 naramsin


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Posted 25 October 2019 - 08:34 AM

I've tried a bunch, and the ones that are stored with the binoviewer are the ES 16mm 68°. They're really wonderful. They're small, not too heavy, comfortable, and very sharp. Drawbacks are: annoying tapered nosepiece and short ER.


Others that I like include my range of TV plossls: new 25mm, and smoothies in 7.4, 10.5, 13, 17, and 21mm. I wish the 25mms were smoothies too....


Decloaked Meade 5.5mm and 8.8mm 82° can work well. Also, KK orthos, esp. 18mm and 25mm. The 25mm HD-60s are astonishingly good, but a bit awkward ergonomically.


I was also surprised how good the 15mm Orion Expanse clones worked. They might be the best bang for buck in my experience.


My scopes include 80mm refractors, a 102mm Mak, and 6" F/8 and 8" F/5 newts. I use the Siebert OCA with the newts and fracs.

#32 Ohmless



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Posted 31 October 2019 - 02:21 AM

I use my Celestron binoviewer on everything in my 6" f/5 reflector. The binoviewer was the best upgrade I have ever added to my kit.


I get 4/5ths of a degree FOV with the WO 2x OCS when using my pair of 25mm HD orthos.  I rarely need more FOV than that to be honest.  They stay in the binoviewer over 90 percent of the time. I don't perceive any vignetting when at the eyepiece.  I know they are near the max field stop that is usable in my unmodded binoviewer.


I have another bino pair(15mm dual ED Paradigms) but I only use them for maximum power planetary stuff in good conditions.

#33 REC


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Posted 07 November 2019 - 01:59 PM

I love my Brandon 16mm, crisp clear and very light weight. Even in my C102 the moon looked gorgeous and tak sharp detail in the craters.


For lower power I use a pair of Mead 26mm SP. Cheap but good.

Edited by REC, 07 November 2019 - 02:00 PM.

#34 Jeff B

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Posted 09 November 2019 - 11:01 AM

"For lower power I use a pair of Mead 26mm SP. Cheap but good."


Indeed.  You don't need fancy, expensive eyepieces for low power.  My good old Celestron Silver Top 26mm Plossls and Edmund 28mm Plossls are just great bino-viewing pairs.  And no stinking undercuts.



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#35 scarubia


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Posted 09 November 2019 - 02:50 PM



Regardless of everything else, if it's not comfortable it's not in my EP case.



#36 denis0007dl


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Posted 09 November 2019 - 04:17 PM

1. Comfortable eye releaf
2. Pure chrystal clean image
3. No ring of fire near field stop

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