Antono Refa said:docsmith said:Figuring out how to get faster than f/2.8 would also be amazing.
I doubt a 70-200mm f/2 would be popular in the stills industry for several reasons:
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[*]Price. An f/2 zoom will be expensive.
[*]Weight. The existing 70-200mm f/2.8 lenses weight ~3 pounds, an f/2 would be significantly heavier.
[*]Front element at least 100mm in diameter. 105mm screw in filters are expensive and rare.
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My bet is such a lens would be heavier and more expensive than a 300mm f/2.8, so at least 6 pounds and $6,0000. Might work for the cinema market, as another poster mentioned.
Seeing that there exists exactly one commercially available full-frame f/2 zoom, the Sigma 24-35mm A, I think it's safe to say that a 70-200mm f/2 is far beyond the limits of engineering and economical feasibility, at least pending major breakthroughs in optics such as full-spectrum optical metamaterials.
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