I don't need the fast aperture. I simply pump up the ISO. Also, I wouldn't want to do without IS, now that I'm used to hand holding at 1/10-sec. (Thanks to all my super-tele experience, I'm probably better at hand holding than most).
Still, that's a great lens and I understand why so many buy it.
Next on my list is a 15mm f/2.8 diagonal fisheye.
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