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Equipment Discussions >> Binoviewers

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aa5te
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Reged: 08/30/08

Loc: Clinton, TN
What other eyepieces do you recommend?
      #5552417 - 12/03/12 05:04 PM

I've got an Orion Binoviewer with a pair of 32mm Plossls on the way as I type this. Scopes that I'll be using this in:
Meade DS-16 16" f/4.5
Hardin Optical 10" f/5
and possibly the Orion 120mm SVP.

Would I be pretty well set if I got another Meade 18mm UWA and a Celestron Luminos 10mm (taking the 2x barlow into account)? Or should I strongly consider the ES 24mm 68 degree eyepieces?

Thanks!


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johnnyha
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Loc: Sherman Oaks, CA
Re: What other eyepieces do you recommend? new [Re: aa5te]
      #5552649 - 12/03/12 07:23 PM

The 24mm 68 will vignette in the Orion Binoviewer, there is not enough clear aperture - you'd be better off with a 20mm if you go that route.

The 18mm UWA would have to be de-cloaked to fit your ipd. With a 25.9mm field stop though, it will also vignette.


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Ed D
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Re: What other eyepieces do you recommend? new [Re: johnnyha]
      #5557118 - 12/06/12 09:19 AM

+1 what Johnny said. With 32mm and 20mm Plossls you should be all set using the 2x barlow element that comes with the Orion. Also, try using the BV with a 2x barlow instead of the barlow nosepiece it comes with. The 2x barlow will give an actual magnification of about 3.7x to 4.0x. Observing with two eyes is not like observing cyclops, especially planetary and lunar. I think you'll be surprised what Plossls can do in a binoviewer.

Ed D


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gonzosc1
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Reged: 11/08/12

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Re: What other eyepieces do you recommend? new [Re: Ed D]
      #5557796 - 12/06/12 04:04 PM

aa5te, don't mean the hijack your thread, were in the same boat..
are there any wide field ep's that can be used in the orion? 55", 60", 65"???
just got one myself and looking for ep's. it came with celestron e-lux 25mm pl's
I also found a used siebert 3 in 1 multi mag to go on it as the first owner lost the factory barlow.


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aa5te
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Reged: 08/30/08

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Re: What other eyepieces do you recommend? new [Re: gonzosc1]
      #5557850 - 12/06/12 04:44 PM

No problem, gonzosc1, because I want to know the same thing (hence my mention of the UWA eyepieces), but I didn't directly state it.

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johnnyha
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Re: What other eyepieces do you recommend? new [Re: aa5te]
      #5558304 - 12/06/12 09:21 PM

You can use a 20mm 68 degree in the WOs without vignetting. So say,instead of a 24mm ES you would use a 20mm ES. You would have a slightly smaller field but on the upside, a darker background and bigger features. Check the specs on the eyepieces and look for something with a 22mm or smaller field stop to avoid vignetting issues. Or, use the 24mm ES and don't worry about the vignetting, you'll still get 60 degrees or so and it will look fantastic.

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Mike B
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Re: What other eyepieces do you recommend? new [Re: aa5te]
      #5559157 - 12/07/12 11:52 AM

Quote:

(hence my mention of the UWA eyepieces)




If the 18mm UWA's would vignette in that BVer, then possibly a pair of Meade 14mm's could work? I BV'd a set of these for quite a while- they have pretty good ER for this eyeglass wearer... their only possible downside is, of the Meade s.5k series of UWA, these have the most field-curvature ('FC'), so their outfield tends to be a bit softer than other UWA's. They are a bit bulbous, but i had no issues (i think my IPD is ~62mm iirc?). YMMV.

Also worth mentioning are the Speers-Waler line of UWA's... they have a 13.4mm & a 17mm EP that might work well. I BV'd a set of their 9.4's a while back, and the views were pretty nice. Not quite Naglers, but fairly close. The 9.4mm has decent ER, about 15mm or so? The others have less, maybe ~12mm. But they are a full 80* EP, and tho oddly tall, are quite comfy for the eye(s).


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gonzosc1
sage


Reged: 11/08/12

Loc: South Carolina
Re: What other eyepieces do you recommend? new [Re: Mike B]
      #5559494 - 12/07/12 03:31 PM

well I'm just gonna take shot at it. I ordered 2 Russell Optics 14mm super wides. 65' field. so we will see what the orion BV thinks about them. while I was there I also order a 2" 20mm wide field 60' just for scanning.

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aa5te
Genial Procrastinator
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Reged: 08/30/08

Loc: Clinton, TN
Re: What other eyepieces do you recommend? new [Re: gonzosc1]
      #5559695 - 12/07/12 05:59 PM

I bought another 20mm Orion Expanse/clone today to try out (since I already have one). Keep in mind that, even though this will be in f/5 and f/4.5 scopes (which are terrible for the 20mm & 15mm Expanse), there's a 2x barlow in the mix (which tends to straighten them out). We'll see how this works, but it'll be some time before I can test and report back.

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