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Thread: Binoviewer and EP question

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    Default Binoviewer and EP question



    So I am thinking of a binoviewer (I've been thinking about one for a while).

    I am thinking the WO binoviewer, it comes with a pair of 20mm EPs that would fill a void in my EP case.

    My question is about my ES EPs, anyone with a binoviewer and the ES 82 degree EPs?

    Will I still have the wide FoV through the binoviewer?

    I understand I will be trading off light loss as the light is now switched to two EPs for clarity.

    The WP binoviewer comes with a 1.6x barlow which will make me have to regenerate my magnification cheat sheet for my scopes. I am a little concerned about my workflow of jumping between my 30mm 2" and back to my 1.25" EPs. Is this a chore to keep swapping out?

    I am mainly into DSO viewing, not a big lunar/planetary viewer (though Ray is getting me interested in exoplanets).

    Am I overthinking this?
    Glen | N1XF
    Scopes: Zhumell Z10, Explore Scientific AR102, Explore Scientific 16" Truss Tube Dob Gen2
    Eyepieces: 40mm, 30mm, ES (82°) 24mm (on the way), 14mm, 8.8mm, 6.7mm, 4.7mm, Zhumell 8-24 Zoom
    Binoculars: Oberwerk 11x70, Canon 10x30IS, Nikon 16x60

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    Default Re: Binoviewer and EP question

    Clear aperature is only 20mm so as long as the field stop of the eyepiece is that size or smaller it will not vignette the view.
    The Celestron is the same binoviewer and sells for quite a bit less.
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    Default Re: Binoviewer and EP question

    Quote Originally Posted by Gabby76 View Post
    Clear aperature is only 20mm so as long as the field stop of the eyepiece is that size or smaller it will not vignette the view.
    The Celestron is the same binoviewer and sells for quite a bit less.
    Thanks Gabby, I've seen the term "clear aperture" but until your post, I never understood the meaning (or importance).

    I thought I found a review somewhere that showed the William's Optics were made in the same Chinese factory as five others, including Celestron.

    I've found a lightly used pair, the seller has another set already.

    I am going to keep looking.
    Glen | N1XF
    Scopes: Zhumell Z10, Explore Scientific AR102, Explore Scientific 16" Truss Tube Dob Gen2
    Eyepieces: 40mm, 30mm, ES (82°) 24mm (on the way), 14mm, 8.8mm, 6.7mm, 4.7mm, Zhumell 8-24 Zoom
    Binoculars: Oberwerk 11x70, Canon 10x30IS, Nikon 16x60

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    Default Re: Binoviewer and EP question

    If you care for some reading. I have the same set branded Stellarvue and had them modified by Siebert Optics after the prism got misaligned. He opened them up to 25mm and it made quite the difference.
    Review: Binoviewers (Zeiss, Baader, William Optics, Siebert, Denkmeier......) - Binoviewers - Cloudy Nights
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    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
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    Ya gotta keep this Apo/
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    Default Re: Binoviewer and EP question

    I have a WO binoviewer and use a pair of ES 14mm and 11mm 82s and notice no problems. I have the pair of WO 20mm EPs that come with the binoviewer and a pair of Meade 5000 25mm HD60s. All the EPs work well with it. I also have a pair of 15mm plossls, but use the ES14s instead, but the plossls work well. Most of my binoviewing is planetary with a little small brighter DSO observing.
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    Default Re: Binoviewer and EP question

    I have a WO BV and use the following pairs: TV 19mm and 24mm Pan, WO 20mm (very nice), 14mm ES82n, and RKE 28s for the 3D effect (very entertaining!). For the remaining gaps I will probably pick up another 11mm ES82n and a second TV 16mm Nagler T5 if I can find a good deal (if not I can live with the gap). I prefer pairs to plugging in Barlows or Powermates but they do get the job done if you want to minimize your pairs. I think you will enjoy the WO BVs, especially for lunar and planetary. The smaller prisms limit the maximum FOV but you can squeeze lots of globulars (my BV favorite DSOs) and other goodies in there. Have fun!

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