OS is also useful for stabilizing the viewfinder, aiding in optimal composition, and for stabilizing video recording, creating a handheld result that is much more pleasant to watch. Our results show that sharpness is slightly improved overall, especially when used wide-open at f/2.8 from corner to corner and at the mid- and longer focal lengths where large-aperture zooms tend to struggle (even high-grade models).

24-70mm F2.8 DG OS HSM – Sigma UK

This lens becomes extremely sharp when stopped down one stop and any differences realized by stopping down to f/5.6 are minor in this portion of the image circle.Since Sigma reverse engineers (vs. licenses) manufacturer electronics and algorithms, there is always the potential for a DSLR body to not be supported by a (likely older) third party lens. The front lens element has a water- and oil-repellent coating that aids in keeping the lens clean and makes the lens easier to clean if something does adhere.

24-70mm F2.8 DG DN | Art | Lenses | SIGMA Corporation

Summing this lens up in a paragraph or two is actually quite difficult, as it's almost like I've tested two completely different lenses at once. The first one being an f/2.8 zoom lens, which should be great for low light photography, but unfortunately falls slightly below par in terms of performance, especially at focal lengths beyond 35mm. Here the resolution at maximum aperture just isn't what you'd expect for a flagship lens from any lens manufacturer. While they could be simply trying to stay ahead of reviewers, far more likely is that manufacturers are pouring every bit of technological advancement possible into this lens category. bug fixes, compatibility updates, feature enhancements, etc.) and allows precise autofocus calibration at four distances. As an experienced lens manufacturer that has been creating a diverse range of interchangeable lenses, we have started the innovative chargeable service “Mount Conversion Service”. With this service, the mount of your current SIGMA lenses can be changed to another mount of your choice. It gives a new life to your favourite lenses when you wish to use it on a different camera body. Still, my lens is front-focusing slightly on my 5D Mark III at 24mm and showing some slight focus inconsistency at 70mm.

Positive is the overall smooth and comfortable shape of this lens, featuring very little diameter change after the initial stylishly-tapered transition from the narrower mount diameter. Results at 50mm f/2.8 look similar to 35mm f/2.8 except that the center of the frame now becomes quite soft/blurry. Slight improvement is seen in the periphery at f/5.6, but across the frame image quality is very good at f/4. The Sony is the considerably-more-expensive option, but the price of the adapter takes a noticeable bite out of that difference. I expect that bringing this lens up to the new Sigma quality standards would make a big difference in my recommendations.