This 20mm is a Super wide-angle lens with a large aperture of f/1.8 and angle of view 94.5°. It has Macro focusing capability with a minimum focusing distance of just 7.9", for a reproduction ratio of 1:4. The 9-bladed iris diaphragm obtains beautiful out of focus image characteristics. Aspherical lens elements in the front & rear lens groups minimize distortion, spherical aberration and astigmatisms. The lens has non-vignetting optical construction in order to obtain adequate peripheral brightness with wide apertures-especially desirable for digital cameras. The lens incorporates a rear focus system eliminating front lens rotation. The focusing ring does not rotate during autofocus yet provides adequate focusing torque of the focusing ring during manual focusing of the lens. The lens materials used in this new lens are lead and arsenic free ecological glass.
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Sigma Super Wide Angle 20mm f/1.8 EX Aspherical DG DF RF Autofocus Lens for Nikon AF-D
Sigma 20mm f/1.8 Overview
Note:
AF not supported by D40 and D60 cameras.
Sigma 20mm f/1.8 Specs
| Lens Mount | Nikon F |
| Angle of View | 94.5° |
| Minimum Focus Distance | 7.9" / 20.07 cm |
| Maximum Magnification | 0.25x |
| Optical Design | 13 Elements in 11 Groups |
| Diaphragm Blades | 9 |
| Dimensions (ø x L) | 3.5 x 3.4" / 8.89 x 8.64 cm |
Packaging Info
| Package Weight | 1.7 lb |
| Box Dimensions (LxWxH) | 5.7 x 5.4 x 5" |
Sigma 20mm f/1.8 Reviews
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question
i have a nikon d3100 will this lens work?
This lens will fit your D3100 so long has the lens has a Nikon mount.
Date published: 2018-08-27
question
Will the angle of view change if my Nikon is an APS-C type (I use a NIkon D5200)?
Yes, it will. You'll have to multiply your crop factor times the 20mm. For a 5200, I believe this will give you a 30mm equivalent.
Date published: 2018-08-27
question
Is this compatible with a Nikon D40?
The lens can mount on the Nikon D40, and the autometering features will work, but the lens does not have a motor built into it to drive the AF on the D40 and other similar Nikon models which require a motor in the lens. It is manual focus only on this camera.
Date published: 2018-08-27