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he said that the clarity of the more expensive glass itself--not a larger aperture--allowed him so shoot at a lower ISO. He compared it too there being different grades of diamonds with the better rated ones having more clarity.
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Now that
is a load of crap.
I've heard of coatings allowing for better light transmission but it usually doesn't amount to more than 1/3 of a stop.
Stay on target... Stay on target...