cvedeler
Carpal Tunnel
Reged: 12/20/05
Posts: 2203
Loc: Scottsdale, AZ
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I was so impressed with the view using a Binoviewer at a recent star party I'm getting one (Burgess 24). I have a Televue Ethos eyepiece and it is by far my favorite eyepiece, but I'm wondering how it compares subjectively to using a binoviewer with 68 AFOV eyepieces? Clearly the Ethos gives more AFOV, but using both eyes seems to give the illusion of more. Any thoughts?
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Chris Vedeler
Astro-Physics 160EDF
Astro-Physics 900GTO
Q453HR / QHY8 CCD camera
Canon 450XSi
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www.aznightsky.com
Scottsdale, AZ
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Joe Ogiba
Postmaster
Reged: 02/14/02
Posts: 5446
Loc: NJ USA
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Denk II with 84° 20mm Widescan III's show a much wider AFOV than 68° eyepieces and a much wider FOV than the 13mm Ethos that is equal to a 16.5mm 82° Nagler.
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Pentax PF-80ED,Meade 102ED APO,Orion EON 72,120ST
Apex 127,C6 XLT,CR150,C9.25,XT10 ,Celestron Regal 100 F-ED, CT152
Zeiss 7x42 FL,Canon 10x42L IS WP,15x50 IS
12x36 IS II , Pentax 8x32 ED
Garrett Optical 28x110 HD-WP Signature Series
Oberwerk BT-80 45, Apogee RA-88-SA
Denk II Power x Switch binoviewer w/13mm Ethos, 20mm Pentax XW's, 20mm Widescan III's.
21mm Ethos,17mm Ethos, 22mm Nagler, 40mm Pentax XW, 14mm Pentax XL, 5.2mm Pentax XL, 8-24mm Pentax XL Zoom, 31mm Axiom LX
Member #17
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George N
Carpal Tunnel
Reged: 05/19/06
Posts: 2067
Loc: Binghamton & Indian Lake NY
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Quote:
...I have a Televue Ethos eyepiece and it is by far my favorite eyepiece, but I'm wondering how it compares subjectively to using a binoviewer....
I’m not sure that this is an exact answer to your question, but: At Stellafane three friends (but not I) had a chance to look thru an Ethos on a large Dob. Two of the four of us are long-time Obsession 20 owners and we all have long-time observing experience. I had, for the first time, a borrowed Denk Binoviewer. I asked all three, if they could have only one, which they would purchase: the Ethos or a Bino-viewer. All three said without hesitation it would be the bino. That was the judgment of long-time big Dob people exposed to the Ethos and bino-viewing for the first time.
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George N
Obsession 20
Optical Guidance Systems 10" F/9 R-C Cass
6" F/5 & 8" F/8 home-made Newts
Explore Scientific 127mm ED
MI-250 mount
Denk II bino-viewer, with PowerX and Newt reducer
SBIG STL-1301E CCD
Member, International Dark-Sky Association
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CESDewar
GorillAstronomer
Reged: 01/16/05
Posts: 2085
Loc: Blue Ridge, GA, USA
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I find it a tough call in smaller, short FL scopes. On the one hand, using two eyes is much easier, on the other, the increased light-gathering and FOV weighs....
I have spent an evening with my Denk II's (& Denk 21 EP's) on my NP-127, and an evening with the Ethos. The Ethos provides 50x with a 2° FOV which is just about perfect for observing open clusters and most DSO's. The view in the Denk II's is noticeably dimmer, but it's much easier on the eyes to observe. OTOH, with a smaller scope, you are trying to eke out every bit of light-gathering power you can.
At the end of the day, I'm not about to sell either of them.
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bbriggs
sage
Reged: 01/09/06
Posts: 217
Loc: Graham, Wa.
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CESDewar makes and excellent point that is the crux of the issue with binoviewers. The size of the telescope makes a big difference in what you will be able to see. It would be a hard call to pick an ethos over a binoviewer in a refractor. I think that I would rather have the ethos and maximize the aperture in a refractor. I have a big reflector (18") however and even with the light loss from the binoviewer the views are fantastic with two eyes. I don't have an ethos yet but probably will have by the end of 2008 so at one of the star parties I will be able to do some tests with both setups on the 18
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18 f4.5 home made newt
14.5 f4.5 homemade newt w/Zambuto
16x70 Fujinon Binoculars 20x110 Garrett Binoculars
Denk II power x switch 21's and 14's
31, 17, 9 Naglers
Televue Ranger
Astrogizmos Portable Observatory
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