Given that my 24-105 f/4L IS was <1000€, the new primes would have to be as good as the Zeiss ZE 25 and 28 in order to pique my interest...
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Auto focus at f/8, non of the current lens line up is less than f/5.6 and as far as I remember non of the EF range ever has been. Even the ultra rare 1200mm manages f/5.6, the only lenses which will fit are the old mirror lenses, but they don't autofocus anyway. Given a camera costing this much what lenses are there which need this feature?
Two possibilities come to mind immediately for that aperture and focal length.
1) It's for a extremely high resolution lens, with absolutely no chromatic aberration or distortion. Something like the Zeiss Superachromatic designs of the 1960s. Many say their sharpness has never been matched and give stunning results in black and white and in color (although it's too sharp and unforgiving for flattering portraits). Can also be used for IR photography as the focus is the same across a wide range of wavelengths. Notable for it's six element design with one achromatic pair.
The 100 has T*... What does that mean?
There is the 17-70mm f2.8-4 OS HSM from Sigma...
We’ve seen one report about an October ship date for the 5D Mark III. If it’s not the 5DX/Mark III coming in the next month or so, then something else will be.
If I could pick really only one then I'd go for the 50L - if alternatives are allowed I might opt for the Zeiss 50 1.4 instead.
Maybe not what you are thinking of, but I would be absolutely thrilled to see an EF-S 15-70 (or similar range) in a constant f4.
Does anyone have any experience with this lens on a APS-H sensor lens? What about full frame?