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Old 08-31-2012, 01:15 PM   #70
Penforhire
Wizard
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Ever heard of multicoated lenses and filters for cameras? There are coatings that transmit nearly 100% of incoming light (minimal difference between F-stop and T-stop values), albeit expensive. There are also constructions with negative (!) index of refraction. I do not believe the issue is physics, more like form factor and budget.
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