« on: April 21, 2013, 10:59:44 AM »
1.8 + OS = dont think so!!!!
A fast lens with stabilization is the best of both worlds. For one, just because you can shoot wide open doesn't at all mean you want to. A 135 f/1.8 is going to have a razor-thin depth of field. There'd be plenty of times you'd want to stop down to at least f/8 to have all of your subject in focus. If you're in Sunny f/16 light, you can easily get hand-holdable f/8 exposures at 135mm. But with stabilization you could step indoors, keep your aperture at f/8, boost the ISO to 3200, and still have a fast enough shutter for portraiture even if not action. That opens up an awful lot of doors.
Yes, all nice. But i am not worried about the need of such a lens. More about the possibility to even build it! (For a price someone can pay)
But seems like its more easy to add IS/OS to a telephoto-lens. So there is a little chance to get that but i am not really confident.
BTW: The canon 135 is even a bit faster than f/2. Could be that the Sigma will be only 1.9 and they are cheating a bit...