P_R said:Not sure of the other three, but the 50mm/f1.0 is most likely not available any longer due to:
Cost, likely to be twice the cost of the f/1.2, so >$4k or more?
Size, large front element equals weight.
Performance, try nailing f/1.0 on your subject matter. And used in low light to take advantage of f/1.0 might be even harder. Corner softness and vignetting at f/1.0 may be higher than desired.
Relevance, better low light performance with DSLR might negate the need for such an extremely wide aperture
Competition, no one has an f/1.2 except Canon and it has AF, so why produce and even faster 50mm lens?
Cost is not really an issue if the lens is desirable enough. All the big whites cost much more than that; the 11-24 is $3k. But in any case there's no reason why it should cost a lot more than the 85/1.2 as it would be about the same size, and that's only $2k.
Focusing would be a challenge, but these lenses are not intended for point'n'shooters.
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