Need a fast prime lens? How about three of them? And don’t want to swap lenses? Well now that far-fetched idea is a reality thanks to the new Sigma 24-35mm ƒ/2.0 Art lens. This full-frame DSLR lens is the world’s first zoom lens for full-frame cameras with a constant ƒ/2.0 aperture. Providing three versatile prime lens focal lengths — 24mm, 28mm and 35mm, plus all focal lengths in-between of course — the new Sigma 24-35mm ƒ/2 aims to offer the convenience of a zoom lens with the optical quality and fast aperture shooting qualities of a prime lens.
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https://www.imaging-resource.com/news/2015/07/13/sigma-24-35mm-f-2-art-lens-review