It now seems to be accepted by most commentators that the similarities are too great to be a coincidence. It would not surprise me at all to find the lens simply isn't that great at f/2.8 - which could be the cause of some images looking less than stellar. At the launch of Leica’s new budget 24-70 mm Vario-Elmarit f/2.8 last week, the similarity in specification to the Sigma 24-70 f/2.7 DG DN Art zoom was noticed by industry pundits.
The price you paid sounds low to me, but the older Sigma 24-70 was never as expensive as the Nikon, nor as good. These are used to block strong light sources, such as the sun, from the lens to. Focus hunting is just a sign that AF does not manage to lock on to something, so it's not necessarily a lens problem at all. Buy Sigma 24-70mm f/2.8 DG DN Art Lens for Sony E featuring E-Mount Lens/Full-Frame Format, Aperture Range: f/2. It comes with a lens hood so that you dont have to buy it separately. And maybe it is a bit of both, so while this might not solve your issue right away, it will help you avoid similar issues.ĪF can struggle in mid day all the same if there is no clear contrast available near the selected AF point or using the mode where the system selects which AF points to use. Focal Length Range There is a reason that the focal length or focal length range is included in the product name of every DSLR lens produced today. Before jumping to the conclusion that it is the lens, I'd try to understand the circumstances under which the AF struggles better, and "study" the images where the focus is off - to ensure it is not somehow related to AF settings, problems with (lack of) depth of field, and so on. What photographers demand from the 24-70mm F2.8 specification is much more than outstanding image quality. The Sigma 24-70mm f/2.8 DG OS HSM Art Lens brings the 'Global Vision' treatment to Sigma's version of this highly popular lens model.
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