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Parker Nite Fly
member
Reged: 02/05/06
Posts: 99
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I have scanned through the best of posts and reviews and am confused!
In one place I read that CA was one of the least concerns when comparing bin unless observing bright objects - the Moon or terrestrial objects. Another place I read that the LW suffer more CA than the standards (I assume because of the shorter length).
So my question is for astromomical usage excluding the Moon is there sufficient visible optical difference between the 2 models? I.E. is there a good reason other than price to choose one over the other?
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Hardin DSH-8
Orion SpaceProbe 130ST
11x56 Oberwerk
7x35 Jason (don't laugh - you'll hurt its feelings)
Edited by Parker Nite Fly (08/10/08 05:07 PM)
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Double Vision
member
Reged: 11/09/07
Posts: 17
Loc: D/FW Texas
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That's been my understanding, as well. The longer focal length of the Standards is supposed to reduce chromatic aberration. I've seen Jupiter through a pair of 20x80 LW's, and the CA was very noticeable. Views of the moon were quite nice, though. Deep sky views were very good, but I could also detect some CA on the brighter stars.
I hope some of our experts jump in and elaborate on this topic, because I'd like to learn more about what causes this problem, and how to minimize it.
(One of us needs to update our avatar!  )
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Garrett Optical 28x110HD Signature Series
Oberwerk 20x80 Deluxe II
Oberwerk 20x80 Standard
Garrett Optical 15x70WP-CF
Garrett Optical 10x50 Gemini
Bushnell 8x40 fitted w/solar filters
Focal 7x50
Celestron NexStar 11 GPS
Edited by Double Vision (08/10/08 10:18 PM)
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Bonco
Carpal Tunnel
Reged: 04/17/06
Posts: 1971
Loc: Florida
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Can't answer directly as I've not viewed thru the Standards.
The LW certainly has noticable CA on bright stars and planets. It shows a blue fringe on the limb of the moon.
However for sky sweeps and/or locating dim objects they work well for me with no noticable CA. I don't care to view planets with bino's and the moon is excellent despite the fringe. The LW can be mounted on a lighter tripod than the standards and I've even used them hand held to locate dim objects although they certainly need a tripod to get good views of dim objects. I bought mine because I wanted a large bino but light weight. If weight is not an issue for you I suggest the standards.
Cheers, Bill N.
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RV6
Meade 2045
6 inch f/4 RFT R. Fagin Optics
TV Genesis
2.4 inch Lafayette Equitorial
3 inch Polarex/Unitron Equitorial
10 inch Zhumell
PST 40mm Solar scope
4 inch F/15 Antares
2.4 inch Unitron Equitorial
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Corky
member
Reged: 04/22/08
Posts: 29
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I get fantastic views with my Obie LW, but can't compare them to the Standards.
I chose the LW because they are lighter, and have a slightly wider field of view.
The clarity and sharpness is magnificent, as shown by views of the moon. And the focus is perfect: very smooth, large turns needed to change focus, giving great control, and focus is rock solid. Love them!
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DJB
Pooh-Bah
Reged: 02/23/05
Posts: 1259
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Hi all,
I use the OB 20x80 Delux, but it does have to be tripod mounted, of course. I have no problems with it considering the cost.
Best regards,
Dave.
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