News that's a couple of days old already:
http://www.dpreview.com/news/1106/11060105sigma120-300.asp
What is interesting is that this is the first time I am aware of Sigma launching a lens with some sort of "splash-proof design" (sic). I would be interested to see if they update lenses like their 70-200mm f/2.8 to include weather sealing, and whether that puts any price pressure on Canon.... Competition is always a good thing. To date, the lack of weather sealing has been one of the key factors turning many people away from the Sigma 70-200mm. (Of course, there is still the discussion about whether Canon might introduce a change to the EF lens interconnect that breaks third party lenses on a yet-to-be-released body.)
http://www.dpreview.com/news/1106/11060105sigma120-300.asp
What is interesting is that this is the first time I am aware of Sigma launching a lens with some sort of "splash-proof design" (sic). I would be interested to see if they update lenses like their 70-200mm f/2.8 to include weather sealing, and whether that puts any price pressure on Canon.... Competition is always a good thing. To date, the lack of weather sealing has been one of the key factors turning many people away from the Sigma 70-200mm. (Of course, there is still the discussion about whether Canon might introduce a change to the EF lens interconnect that breaks third party lenses on a yet-to-be-released body.)