Third Party Manufacturers / Re: Sigma Announces Three New Lenses: 35 f/1.4, 17-70 f/2.8-4.0 OS & 120-300 f/2.8 OS« on: September 17, 2012, 08:15:27 PM »
Not exactly what was updated on the 120-300. Looks like MTF charts are the same. Perhaps it is lighter and focuses faster?
That is what I was thinking. I thought the 120-300 2.8 OS was released pretty recently. Like about a year ago?
And if I read the description I would have answered my own question
With redesigned mechanics and performance, this Sports lens is an update from its predecessor released in February 2011.
Good God, yes. Just a year between generations/upgrades. Canon still goes 10 years or more even in the digital age. Reproducing at that rate, they could evolve past Canon in quality in not too long.