20mm f/1.8 EX Aspherical DG DF RF Prime Lens
20mm f/1.8 EX Aspherical DG DF RF Prime Lens offers a prime focal length of 20mm, an angle of view of 94.5 û and a fast f/1.8 maximum aperture. The lens is suitable for everyday photography, bearing excellent low-light capability thanks to its fast aperture. It has a 9-blade aperture diaphragm, a maximum magnification of 1:4 and a total of 13 elements arranged in 11 groups.
This Sigma 20mm F1.8 EX DG Aspherical RF is a unique Sigma offering with an aperture of F1.8 making it the fastest super wide angle lens available from any camera or lens manufacturer. For the scenic or landscape photographer itÕs important to have a wide angle lens with excellent optical performance and SigmaÕs aspherical lens technology provides high quality images for the serious shooter. SigmaÕs 20mm lens has a field of view of 94.5¼ and yet provides for a close focusing lens-to-subject distance of only 2.6 inches. Such performance parameters provide great creative freedom to the photographer who wishes to exploit its capabilities for juxtaposing very near subject with the surrounding background. This extreme wide angle view also makes this lens ideal for crating ÒstitchedÓ panoramic scenes for dramatic effect. The architectural photographer will find this lens attractive for shooting building interiors and the photojournalists will find its fast speed a life saver in low light conditions.