« on: September 29, 2012, 07:45:15 PM »
...apparently it has a special digital focusing system.
Ahhhh, so that's how Sigma has chosen to explain their unreliable AF...
The 50L is optimized as a full-body portrait lens. The Sigma is more 'general purpose' assuming you get a good copy.
I went through two copies of the sigma 50 and none were great on either my 5D2 or 5D3. wound up getting the Zeiss 2/50. it just plain looked better in results and felt better on the camera than the canon L did to me. for my purposes manual focus is no prblem. I also shoot weddings with the Zeiss!