I've been reading the specs of some of these lenses, apparently the 10-20 gives a 102 degree diagonal FOV on a crop body while the Canon 17-40 gives 104 on full frame so I've already got a fairly wide lens. However the 12-24 would give me a massive 122 degree FOV, that really would alter how you look at life. I was planning on heading over to try one this morning but now have other stuff that needs doing, hopefully later in the week...
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