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Sigma 15-30mm f3.5-4.5 EX Aspherical DG DF

Review Date: Jun 9, 2009 Recommend? yes | Price paid: $570.00 | Rating: 8 

Pros: IQ, price and good range. Build quality is nice for what it is. Spectacular with film, and even with 1.6 crop it is useful.
flare from the slightest thing, "dual focus" is strange, unnecessary huge. No front filters!, protruding front element, noisy af

I bought this seven years ago with my eos 3 and with 20d and 5d it is so useful. My longest lasting lens and looks brand new. The build quality is great for what it is, and I am still not tempted to buy any newer uw zooms.

The lens is sharp and colors don't disappoint. I mostly use stopped to 7.1 and the distortion control and sharpness is consistent through the focal range. I can barely notice some CA but just barely. Flare is pretty nuts on a good day, and shooting this indoors with lights on is not fun. I am fairly satisfied with this lens even today and am not crazy about the canon 17-40L compared with this. I have yet to compare the 16-35L.

Focus ring is well damped, zoom is smooth, no creep, nothing rattles when shaken.

Nice integrated hood that is tough (bumped many times no paint scrapes or marks)

The dual-focus seems strange, to go from af to manual you have to push the giant focus run forward in addition to the af/mf switch, and vice versa. Basically with the zoom ring on the AF position, it does nothing- it turns undamped and free floats.

This is what happens if you run it in each config:
AF Switch / Focus Ring / Effect

AF / AF / Autofocus fast, floating focus ring (you can hold it and rotate it and it does nothing) < right way to AF

AF / MF / Autofocus, slower like struggling, focus ring rotates < don't leave it like this because this lens isn't FTM

MF / MF / Manual focus < right way to MF

MF / AF / Manual focus, floating ring (basically turns focus "off" at the present focus position) < this could be useful to keep focus at a manual set distance and then hold the lens by the big focus ring and it wont mf and when you press shutter it wont af either.