EXPERT OPINIONS ON ALL THE LATEST HOT KIT
The hottest Nikon-fit kit revealed, including a stunning new Sigma wide-angle
Sigm a 20mm f/1.4 DG HSM | A
Open wide and say Sigma
Wide-angle prime lens £850, $900 www.sigma-global.com
We’ve been very impressed by the f/1.4 prime lenses in Sigma’s new ‘Art’ series, which include the 24mm, 35mm and 50mm. The latest lens in the line-up, the new 20mm f/1.4, delivers an ultra-wide viewing angle of 94.5 degrees on full-frame bodies, while still retaining that wide f/1.4 maximum aperture. Delivering that requires a double aspherical lens element that’s both large and very complex.
The optical path is also relatively complex for a prime lens, featuring no fewer than 15 elements in 11 groups. Autofocus is ring-type ultrasonic, and the f/1.4-16 aperture range is controlled via a nine-blade diaphragm. The minimum focus distance is pretty short, at 0.28m, which enables a maximum magnification ratio of 0.14x. Sigma claims that the highprecision, advanced optical design minimises distortion, lateral chromatic aberration (fringing) and sagittal coma flare (a sort of distortion found at the edge of images, where points of light take on a comet shape), while also keeping vignetting to a minimum. It’s a substantial lens at 91x130mm and 950g, and if previous Art lenses are any indication, build quality and performance should be excellent.
FIRST IMPRESSIONS: We’re expecting this wide-angle lens to be something extra special.
Like SIGMA’s other Art SERIE S lenses, the 20mm comes with a hood and soft case, and is compatible with Sigma’s optional USB dock and mount conversion service