These rubberized rings are sharply-ribbed for a high quality feel and are raised modestly above the barrel for ease of locating. If it is a zoom lens, lateral CA is nearly always present in some amount in at least some of the focal lengths.

Sigma 70-200mm f2.8 OS review | Cameralabs Sigma 70-200mm f2.8 OS review | Cameralabs

Ideal is that the foot comes with an integrated Arca-style lens plate dovetail with two safety stop screws included.Still, these are one of the most useful classes of lenses available and they are well worth the investment and effort to use. SIGMA USB DOCK enables photographers to update the lens firmware and adjust parameters such as focus. Unless your wildlife subject is very large and/or very close, the longest native focal length in this lens (I'll discuss the teleconverter options later in the review) will usually be found far too short for this task. We’d also expected to be able to customize the Focus Hold buttons, for example so that they initiated autofocus instead, but the button setting was greyed out in the Optimization Pro software.

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

It's only when you get to f/5 that it's almost all gone, although even this is only really visible when shooting a uniform subject. To keep this lens as light as possible and also for economic reasons, Sigma utilizes Thermally Stable Composite (TSC) materials along with traditional metals in the design. OS zoom to the test on a 36MP Nikon D800 body to see whether the lens is a good match for the highest resolution full-frame DSLR – and also to find out how it fares compared to Nikon’s own alternative. Coma is absent in the center of the frame, gets worse toward the edges/corners and generally appears as a comet-like or a triangular tail of light which can be oriented either away from the center of the frame (external coma), or toward the center of the frame (internal coma). A telephoto zoom is quite often the second most important lens in many photographers' camera kits (just behind a general purpose zoom lens) and the 70-200mm focal length range is ideal for a wide range of uses.After flaring outward rapidly from the mount, the lens' diameter gradually increases until the objective end. The secret is our passion for craftsmanship that we put into every production process and every product. I mentioned vignetting – it is always present in wide aperture corners unless using a camera that does not include the entire image circle (an APS-C model in this case). The lens foot can replace the original lens’s supplied foot, making it possible to directly attach the lens to the Arca Swiss platforms and screw knob clamps. This lens features a highly effective dust- and splash-proof structure with special sealing at the mount connection, manual focus ring, zoom ring, and cover connection, allowing photographers to work in all types of weather.