Sigma 210101 18-35mm F1.8 DC HSM Lens for Canon - Black

Product Information

Flare slowly increases as the aperture narrows until becoming noticeable at f/8 and by f/16, strong flaring is obvious. DSLR Cameras Canon EOS DSLR Cameras Nikon DSLR Cameras Digital Compact Cameras Instant and Single Use Cameras Instant Cameras Instant Camera Film Single Use Cameras Instant Printers Cameras Mirrorless Cameras DSLR Cameras Digital Compact Cameras Video Cameras Lenses Mirrorless Camera Lenses DSLR Lenses Lens Filters Lens Accessories

At short distances, this lens is practically parfocal (focus distance settings remains the same throughout the zoom range).The Canon, Nikon and Sony mount versions of this lens will mount on full-frame DSLRs, and on Nikon cameras DX crop mode will be automatically selected (the camera will therefore shoot at reduced resolution). The rollover below shows the level of vignetting on full frame, with samples shot on a Canon EOS 6D through an Expodisc white balancing filter. The lens's image circle doesn't cover the 35mm full frame format fully at any focal length, giving severe vignetting at 18mm which decreases progressively on zooming in. There's still visible vignetting in the corners at 35mm, which doesn't entirely go away on stopping down, either.

The perspective required for tight 18-35mm portraits make this lens a bad choice for such – unless you want to get "artistic". Of course, from a high resolution camera, a subject captured at 0.23x magnification can be printed or displayed at many times life size. The Sigma 18-35mm f/1.8 DC HSM Art Lens is one of the first members of Sigma's Global Vision Lens lineup.On the test charts and using the Datacolor SpyderLensCal, the 18-35 f/1.8 focused very accurately with excellent consistently. Since Sigma reverse engineers (vs. licenses) manufacturer AF algorithms, there is always the possibility that a DSLR body might not support a (likely older) third party lens.