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Mk II RA bino: "What the 'L'!"
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Poster: GlennLeDrew (see all of this user's photos)
Description: Assembled, with the 60mm objectives and 13mm Ethos eyepieces installed. No sleek lines or sexy curves here. But the monstrously wide views never fail to engender exclamations from others. This configuration yields 21X60 with a 4.7 degree field.

Vendor - Galactic Stone & Ironworks

Registered: 4/7/2005
Posts: 18328
Sweet! How is the image quality in this configuration? Is it "tack sharp to the edge" type of view, or can you tell that the Ethoi are pulling weight optically-speaking?
Fri Mar 5, 2010 8:51pm
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Registered: 6/18/2008
Posts: 10140
Not sharp to the edge, mainly because of field curvature, which to first order scales inversely with focal length of the objective. But compared to other lesser eyepieces (especially from binoculars), the Ethos is indeed "pulling its weight" due to its high degre of correction. The edge sharpness is about on par with that exhibited by an eyepiece having only half the AFoV. And what's more important to me, the area of the view is 4X larger!
Wed Apr 14, 2010 7:46pm
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Dr Morbius
Post Laureate

Registered: 2/6/2007
Posts: 3681
What the "L" is right!!! Wow!!!
Wed Aug 4, 2010 11:34pm
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Brian Albin

Registered: 8/22/2006
Posts: 844
Hello Glenn,
I have the Tento 20x60 and have never been happy with the view. I have wanted to replace the 20 power EPs with 12 power to widen the view and make it sharp across the field, instead of soft in zones as now, but did not know what focal length to buy. So I am glad to read that the original is something like 13.5mm. It looks like 23mm would put me at 12M. But I wonder if my true view will widen any if I do not also put in wider prisms to avoid vignetting.
Thu Apr 14, 2011 12:28pm
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