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

15_30f35_45_1_
Review Date: Jun 11, 2010 Recommend? yes | Price paid: Not Indicated | Rating: 9 

 
Pros: Built like brick, very solid, sharp, did I mention it was sharp?
Cons:
Built like a brick, poor auto focus, badly implemented AF/MF switching, CA, high barrel distortion at 15mm.

I just got this today used from ebay, what a real gem of a lens. I think I paid about the right price, maybe a bit high but the quality of it more than makes up for it. Its really sharp on my 50 and 5d, have yet to see how it performs on my EOS 3. I mainly do architecture so the barrel distortion at 15mm is a bit of a let down but I have only shot at 20 and 24mm before so might not use the ultra wide on my full frame cameras. The distortion is easily fixed in PT lens and is not bad at the longer end. I have tried to coax some flare out of it as some reviews say this is a problem but I really only got some in very bright sun, I will see how it goes.

Quite poor focus systems on this lens but then I usually use MF on a tripod and live view when on my 50d.

It is built like a tank, no movement whatsoever and has a metal hood. MF ring has nice movement no scratching at all. I was looking at the 12-24 but when this came up I went for it, no regrets so far, even if it has only been a day! I have heard that the 12-24 is not as good as this one. I have got three Sigma lenses, 10-20mm, 17-70mm and now this one. I must say I have had no problems at all with them, the 17-70 is excellent. I did have to send a Canon 70-200 f4 L back because of decentering, bad luck I suppose, most of my lenses have been just fine straight out of the box.

I will post an update when I have had chance to evaluate its performance with some hard use.

If you have a chance to buy this lens, I recommend you do straight away.