wombat
Lives in a hole
Yeah if it's the right mount it should work fine.cheers for the replies guys, much appreciated!
stupid question time: i understand that hsm is sigma's version of canon's usm which is all to do with the way in which the automatic focus motor operates. will a hsm lens be compatible with my canon 40d?
cheers
USM (ultrasonic motoor / HSM (high speed motor, maybe?) is just a reference to the sort of motor the AF uses, and a marketing slogan to say "Hey, I'm fast and quiet! Not like that Tamron you have that is kinda slow, and sounds like an insect orgy inside a megaphone!"
I'd definately consider the 17-55 too; f/4 won't cut it for concerts on the 40D, and the range would be nice on a crop body. If I was buying I'd be torn between the usability of the 17-55, and the fact that the 24-70 would keep my full-frame dreams alive...