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ED glass and low light

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/20/2011 at 07:58
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Optics GrassHopper
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Does ED (FL) glass make a measurable difference in the low light capabilities of a scope?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/20/2011 at 08:15
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TRUE ED glass primarily eliminates secondary chromatic aberration which is a failure of the lens to focus all colors to a single point, which causes a fuzziness in the image and color "smearing".  So, yes ED glass will improve your visible image.  A lot of ED glass is only marginally appropriately named.  Nikon invented ED glass in the mid-70's.

Follow the link below to a pretty good discussion of ED glass and some of the common misperceptions about it:

http://www.opticstalk.com/ed-glass-vs-other-features_topic18435.html
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