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Hi Mike
I’ve got the 17-40L and it is a nice lens. However, I saw some landscape work posted a while ago by Robert_T using a 10-22mm which looked stunning and was much wider (obviously!) than the 17-40.
Just going from memory, when I used to shoot through my 35mm film Pentax KM SLR with a 28mm wide angle lens, on the 40D the 17-40L at the 17mm end seems to cover the same field in the viewfinder.
On the Pentax KM, I found a 24mm wide angle to be very useable with minimum distortion and this would be around 15mm on a x1.6 crop body so if you already have 17mm covered with the Sigma 17-70, I’d probably go for the 10-22, or even the Tamron 11-16 which has a good write up.
Cheers
Dennis
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