17-70mm VS 24-70mm
View Single Post
17-09-10, 03:15 PM
Join Date: Sep 2009
Well, the 24-70 is a full frame lens, as I suspected, and the 17-70 is what Sigma call DC, or we in the Nikon world call DX, so it doesn't cover the full 35mm frame. Also, the 24-70 is f/2.8 over the entire zoom range, but the 17-70 varies in maximum aperture from f/2.8 at 17mm to f/4.5 at 70mm, or probably less. These two factors mean that there's a lot more glass in the 24-70 - it weighs 715g, where the 17-70 is only 455g - and optical glass is expensive.
I think you're probably looking at the wrong 24-70 lens, though. Sigma have two models, the 24-70mm f/2.8 EX DG MACRO and the 24-70mm f/2.8 EX DG HSM. Of these, you want the newer, more expensive, and heavier HSM model, since the other will not autofocus on your D5000. I understand that it's a better lens than the older Macro model.
As a walk-around lens, the 17-70 would suit me better, as I often use wider than 24mm on my DX camera.
Edit: You may want to check the prices you've seen, too, as Warehouse Express has the 17-70 at £250 and the 24-70 at £450 (thats £200 more), with the 24-70 HSM coming in at £600.
Last edited by greenwing; 17-09-10 at
View Forum Profile
Send a private message to greenwing
Find all posts by greenwing