
... This lens made me regret leaving the DX format. It's about 1/2 the size and weight of the comparable FX format 70-200 f/2.8, and is perfect for portraits, SPORTS, candids, and general walking around.
If you're only going to buy one lens to take pictures of your kids football games, this is it.
THE PROS:
* Fast CONSTANT aperture for low light, fast action (and yes, chasing a three year old round the house is FAST ACTION!)
* Set your camera to aperture priority, set the aperture to f3.5 or f/4.0 and leave your flash at home, you'll have super sharp shots you can blow up to poster size
* Light weight and small... Oh so light and small. This lens, and those like it is why the DX format will be around for a LONG LONG time. You can pack so much more capable glass into a smaller package. I'm not replacing mine with a comparable 70-200, way too big way too heavy... I might just buy a cheaper body just for sports.
* HSM - Super-Duper fast focusing. Perfect for action or candid photography. You want to take a picture of a groom sneaking a kiss, without a flash running the moment, or of your kid getting the winning basket. You want a fast constant aperture lens with HSM (or AF-S in Nikon-speak). I looked at the Tokina 50-135 which I really wanted because it was built like a tank, but it focused WAY-TOO-SLOW for sports.
THE CONS:
I will parrot the other reviewer's cons, but with my own comments:
* No VR/OS - Yes, though I don't see where that matters, VR is for taking pictures of STILL objects hand-held rather than using a tripod. It doesn't really help when you're shooting moving objects. The purpose for buying a FAST constant aperture lens like this is to shoot action or low-light (usually both low-light & action like in a gym).
* Lack of sharpness at f2.8 - True. But NO LENS is sharp at its maximum aperture. Top sharpness comes at 1.5 to 2 stops from wide open (on this lens f/3.5-f/4.0)
* Lens Flair and such: I've not noticed that with the APO glass update, Of course I'm usually shooting INDOORS and in LOW-LIGHT where there is very little chance of getting sun-flare.
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SUMMARY:
DO NOT buy this lens specifically for nature, scenic, architecture, or still object photography. You don't need the fast aperture (and you wont be using it, you'll want more death of field). That's not to say that this lens wouldn't also be good at these tasks, just that you can get a lens more suitable for these duties for 1/4 the price (and look for one with VR/OS to free you from your tripod).
Use this lens for Sports, Action, Candid, Indoor photography. Or as a carry around all purpose lens on vacation, when conditions might be uncertain (packing a 14-24 for wide shots in your pocket). The fast constant aperture and HSM make this the only lens worth owning in the category.
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Sigma APO 50-150mm f/2.8 II EX DC HSM Zoom Lens for Canon Digital SLR Cameras