What about low iso. My 7D is noisy at 100 iso. Any improvement?
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On a sensor doubled in size by a factor 2 (crop factor 0.5) a lens 100mm f 2.8 delivers the same picture like a 50mm f1.4 lens on FF.No, it'll be like a 50/5.6. The light is spread out.
The single most interesting thing is going to be the sensor in the new camera.
every lens is tested with Sigma’s proprietary modulation transfer function (MTF) “A1” measuring system before being shipped.
An f/4 zoom lens is not one you'd expect to have optimal light transmission anyway.Isn't the point of lens design to have optimal light transmission? And if the f-stop is four and the t-stop half a stop worse, doesn't that say something about Canon's glass elements and coatings? The Canon 24-105 is a good lens but it should not have been branded with the red ring.
Big DSLR announcement, hmmmm. Could they make a camera with an EF mount? Just think, all the sigma lenses sold to canon users would now work on it along with the canon lenses too, it would be a Trojan horse coup d'e'tatYeah I never understood why Sigma has their own lens mount. Who's going to invest in an arsenal of Sigma-mount lenses? Not me, even if they put out a decent body at a decent price. Much better to have bodies with Canon and Nikon mounts. That way a Sigma camera can mount more lenses ( = more camera sales) and Sigma can simplify its lens lineup by having fewer lens mounts ( = more profit).