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Chris Farris
TEAM SWFA - Admin swfa.com Joined: October/01/2003 Location: Texas Status: Offline Points: 8024 |
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Posted: September/16/2005 at 15:07 |
Here is a copy of an e-mail from Zeiss discussing the differences in their glass. ---------------------------------------------
The normal glass used in optics uses lead, arsenic and other "heavy metals" to increase density so that it bends light more sharply. This also adds to the weight of the glass, introduces some color to image, and absorbs some light. By eliminating the heavy metals, we make the glass both lighter in weight, and more transparent, but we have to then use more elements (glass to air surfaces) to get the same amount of bend. This is a good trade off, since the net effect is a brighter, lighter, more color neutral optic. This is the AOS.
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Rusty
Optics Apprentice Joined: April/12/2004 Location: United States Status: Offline Points: 147 |
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AOS Question?
Chris,
Does the AOS system have any aspherical elements/lenses? I have notice the VII I have has little or very minor distorions near the edge of the field. And yes, the VII does have a fair amount of CA, even in the center on challenging objects (this is really the only negative I have for these binos). I will write up a review/comparison I did between the VII and Pentax DCF WP later on in the review section.
Rusty |
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Chris Farris
TEAM SWFA - Admin swfa.com Joined: October/01/2003 Location: Texas Status: Offline Points: 8024 |
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No aspherics but a very sophisticated 4 element, thin element, air-spaced objective. "The Vlls show a below average amount of secondary color fringing in the center of the field on the most challenging targets"...certainly less than Swarovksi and the Leica Ultra Trinovids. The FLs eliminate that color and are far superior to the ELs and the new Leica Ultravids.
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Rusty
Optics Apprentice Joined: April/12/2004 Location: United States Status: Offline Points: 147 |
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I love my 10X40 VII's, but they do have some CA. However, in mid to low light, they are still better than most current binos.
Rusty |
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Rusty
Optics Apprentice Joined: April/12/2004 Location: United States Status: Offline Points: 147 |
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Chris,
I really checked the Victory II carefully in the center of the field, and you are correct. The center 25 - 30% of the field has very little CA, probably less than SLC's, Leicas, and EL's.. However once you look out of the center 30%, there is CA.
Rusty |
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