Cream of the crop: Sigma 50-100mm F1.8 real-world samples
The Sigma 50-100mm F1.8 is a bit of a rarity. It's a fast telezoom designed specifically for Canon, Nikon and Sigma APS-C bodies, providing 75-150mm equivalent range (80-160mm on Canon bodies). Canon and Sigma mount versions should also work on Sony E-mount cameras with Sigma's new MC-11 adapter. With Sigma's 'Art' designation, it's built to the company's highest standards and includes a redesigned Hyper Sonic Motor and nine rounded aperture blades.
Sigma's F1.8 zooms for APS-C are ground-breaking in the following sense: F1.8 on APS-C gives you around the depth-of-field control of F2.7 on full-frame. That makes Sigma's 18-35/1.8 and 50-100/1.8 roughly equivalent to 27-53/2.7 and 75-150/2.7 lenses on full-frame, in terms of both DOF and noise (in low light) control (read why). For some, these lenses go a long way in addressing some of the inherent disadvantages of the smaller sensor format.
We were lucky enough to get our hands on a pre-production model while we were in Japan for CP+ 2016, and didn't waste any time putting it to work. Due to our limited time with the lens, though, samples aren't as varied as we'd have liked. We'll be adding more to this gallery once we get one back in. For now, enjoy a number of aperture progressions at various focal lengths to get an idea of edge-to-edge sharpness, chromatic aberration, and vignetting performance. Our preliminary thoughts are that sharpness and contrast are impressive for a F1.8 zoom, with center sharpness nearing its peak by F2.8, and extreme edge sharpness maximal by F5.6.
Please note that the pricing displayed below this article for the 50-100mm is inaccurate. This lens will retail for $1099 when available.