Discount Sigma 20mm f/1.8 EX DF RF Aspherical Wide Angle Lens for Nikon SLR Cameras
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Sigma 20mm f/1.8 EX DF RF Aspherical Wide Angle Lens for Nikon SLR Cameras By SIGMA
 Cheap Price for Sigma 20mm f/1.8 EX DF RF Aspherical Wide Angle Lens for Nikon SLR Cameras. With Special Pomotions Fast Shipping List Price :Price Save : $629.00 SalesRank : Warranty:
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Sigma 20mm f/1.8 EX DF RF Aspherical Wide Angle Lens for Nikon SLR Cameras Description
Lens Construction: 13 Elements in 11 Groups Angle of View: 94.5 degrees Number of Diaphragm Blades:. Specifications Focal length: 20mm Maximum aperture: f/1.8 Lens construction: 13 elements in 11 groups Angle of view: 94.5 degrees Number of diaphragm blades: 9 Minimum aperture: f/22 Minimum focusing distance: 7.9 inches Maximum magnification: 1:4 Filter size: 82mm Mount: Nikon Dimensions: 3.5 inches in diameter and 3.5 inches long Weight: 18.3 ounces Warranty: 1 year The Sigma 20mm super-wide-angle lens provides minimal light falloff and superior peripheral brightness, helping you take masterful landscape shots or large family portraits. The lens is equipped with a high-quality Dual-Focus (DF) mechanism. The DF system makes it easy to hold the lens, as the focusing ring doesn't rotate during autofocus. At the same time, however, the lens still provides adequate torque for manual focusing operations. By incorporating a rear focusing system, Sigma made the lens compatible with petal-type hoods, which offer superior light blocking effects. In addition, the lens offers a super multi coating that reduces the flare and ghosting that often occurs in digital cameras, along with nine diaphragm blades to help you obtain beautiful out-of-focus images in the foreground and background. Other features include a minimum focusing distance of 7.9 inches, a maximum magnification ratio of 1:4, aspherical lens elements in the front and rear lens groups to compensate for distortion and spherical aberration, and a 94.5-degree angle of view.
Costumer Reviews
4.5 Out Of 5 Stars (27 Customer Reviews)
Reviews for Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Canon Digital SLR Cameras (Electronics) I have used this lens extensively with the 1D and the Rebel XT. Results have been excellent. My suspicion is that the previous reviewer got a defective or damaged copy of the lens. It is incredibly sharp, even at f1.8, which I did not expect - generally you expect a lens to be a bit soft wide open, especially 1.8. The degree of sharpness of this lens is quite surprising.
I have used, for example, both the Canon 50mm f1.8 and the Canon 35mm f2.0, both of which are deservedly renowned for their sharpness and contrast. I find this lens to be sharper than either of them wide open. The lens provides images which have excellent color saturation and contrast. Of course, at f1.8, depth of field is razor thin, by design, which is great for bokeh or out of focus background, but which also requires care concerning the desired focal point being in focus.
Reviews for Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Canon Digital SLR Cameras (Electronics) I purchased the Sigma 20mm f/1.8 lens, mainly for wide field astrophotography purposes. I refuse to pay what Canon was asking for a comparable lens...this Sigma lens costs less than half of what Canon charges. I can tell you the quality is top notch - well built, very sharp images across the field, easy to use and transport. The two issues I knew about before purchase - the autofocus is a bit rough and noisy compared to the Canon and you have to engage the focus ring for manual focussing - were no surprise, and really not much in the way of issues anyway. The autofocus with the Sigma is a bit noisier than the smooth Canon lens, and is remembering to move the focus ring when manually focusing really a hassle? Some reviewers made it sound horrible, but for saving over $500 I will put up with a little noise and a focus ring......
I captured some fanstastic shots of the Perseid meteor shower while camping at Joshua Tree in early August - the Sigma performed flawlessly. I recommend this lens without reservation.
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