I love this lens, and use it mostly for "people" shots (weddings, headshots, and sports). The bokeh is pretty smooth, the focus speed is *just* slightly slower than the Canon version (but still very fast & accurate), and the colors are very true-to-scene. There's a slight vignette (-2.8EV) at the corners of the frame at f/2.8. It's consistent through the zoom range, and is all but gone at f/4. If you use a Nikon camera, the automatic Peripheral Illumination Correction feature compensates for the vignette when shooting JPGs; I wasn't able to test a Canon-mount version of the lens to see if automatic corrections were available. A focus limiter switch provides the full focus distance range or optionally limits the focus range to between 9.84'(3m) - ∞, for potentially faster focus acquisition. This is one of those great lens values that comes along and makes you re-think the amount of money you've sunk into "L" glass.

Sigma 70-200mm f/2.8 DG OS HSM Sports review

F/8 is wide enough to use for the wildlife and sports photography that these focal lengths are especially well suited for as long as the lighting conditions are relatively bright. The f/2.8 aperture represents the widest aperture available in a 70-200mm zoom lens and, even with the improvements we've seen in contemporary interchangeable lens cameras' high ISO performance, f/2.8 remains the minimum aperture I want to have when photographing indoor activities.those capturing portraits or photographing low light events, including sporting events, definitely will. Cityscapes are essentially landscape images with cities in them and this focal length range is often a great choice for more-distant city views. Towards the rear, there’s a smorgasbord of switches, enabling the selection of two autofocus modes with priority given to either automatic or manual-override focusing, as well as fully manual focusing. Next up, there’s an autofocus range limiter switch that, by default, cuts out the short range from 1.2m to 3m. There's a lot to love about this lens. With excellent detail at even wider apertures, great control over chromatic aberrations, very effective image stabilisation and prompt autofocus, it delivers what the professional demands at this level. Great build and weather sealing make it even more competitive, as does that price tag. It's not a cheap lens, but you get an impressive performance for the money. This reviewed lens showed good overall optical alignment, so the selected corners mean little aside from knowing which corner of the crop is the absolute corner of the frame.

Sigma 70-200mm f/2.8 EX DG HSM APO - Digital Cameras, Digital Sigma 70-200mm f/2.8 EX DG HSM APO - Digital Cameras, Digital

At 200mm, the wide open center-of-the-frame performance is not quite as good, but this lens is still performing at least nearly as good as the best from an overall perspective.The longer the focal length, the more obvious the improvement seen at f/4 becomes and the more that improvement is needed over the f/2.8 performance. A relatively common lens aberration is axial (longitudinal, bokeh) CA, which causes non-coinciding focal planes of the various wavelengths of light, or more simply, different colors of light are focused to different depths. Dynamic View Mode, my preference for general purpose photography, provides a beautifully-stabilized viewfinder image and the default Standard mode shows a moderately-stabilized view. the reason for using an extender is to gain a longer focal length than is natively available in the lens and that means any with-extender focal length below the 143mm mark can be better-served without the extender in place.