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Old 19-06-2015, 02:04 PM
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gregbradley
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Join Date: Feb 2006
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TEC optimise their lenses at .99 strehl in green with a low of .69 in far blue. So TEC and I am sure AP rate their Strehl at different wavelengths.

The overall average is more like .9 or so. .8 strehl may be the overall average at various wavelengths of the visible spectrum.

Yes I heard Tak got their fluorite lenses from the same company as Canon. I am not sure if they still make fluorite lenses anymore?

Greg.
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