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Sigma 20mm F1.8 EX DG ASP RF Lens
For Nikon F Mount
Fixed focal-length. No zoom.
Rectilinear are normal lenses that show straight lines as straight lines.
Thread size in milimeters for screw-on filters.82
Autofocus Lens
Discontinued: No longer produced by the manufacturer. May still be in stock or found used.Lens Description
The Sigma 20mm F1.8 EX DG ASP RF is an ultra-wide prime designed for cameras with a Full-Frame sensor. This ultra-bright prime has a 20mm focal-length.
This prime lens focuses down to 20cm from the imaging plane, capturing subject with a maximum 0.25X magnification. The lens supports autofocus and features a switch to disengage AF for focusing manually. A built-in focus motor is used to set the focus-distance. It allowed Sigma to optimize the motor precisely for this lens in order to maximize performance.
The lens weighs 520g.
This version of the lens has a Nikon F mount. It directly attaches and is fully compatible with all Nikon F mount cameras with Full-Frame or smaller sensors. Sigma also makes this lens for Canon EF, Pentax K, Sony A and Sigma S mounts.
Focal-Range
Angle-Of-View
Maximum Aperture
Viewing Angle Range
Maximum Aperture
Magnification
Weight
Sigma 20mm F1.8 EX DG ASP RF Specifications
| Brand | Sigma | Model | 20mm F1.8 EX DG ASP RF |
|---|---|---|---|
| Mount | Max FLM | 1X | |
| Focal Length | 20mm | View Angle | 94° |
| Max Aperture | F/1.8 | Min Aperture | F/22 |
| Min Focus | 20cm | Magnification | 0.25X |
| Filter Size | 82mm | Aperture Blades | 9 |
| Size (D x L) | 89 x 87mm | Weight | 520g |
| Tilt | N / A | Shift | N / A |
| Stabilization | Protection | None | |
| Zoom Drive | N / A | Focus Drive | AF with MF Switch |
| Zoom Mechanism | N / A | Focus Mechanism | Internal |
| Hood | Bayonet | Focus Motor | Internal |
| Perspective | Rectilinear | Introduced |
Similar Lenses For Nikon F Mount
Here are the newest lenses matching or exceeding major specifications of the Sigma 20mm F1.8 EX DG ASP RF. They cover the same focal-range with a similar aperture and are available for the same lens mount and imaging circle coverage.
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ZY Optics Mitakon Creator 20mm F/2
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Sigma 20mm F/1.8 Facts
Fixed focal-length. No zoom.Rectilinear are normal lenses that show straight lines as straight lines.Thread size in milimeters for screw-on filters.82Autofocus LensDiscontinued: No longer produced by the manufacturer. May still be in stock or found used.| 20mm Focal-Length | F/1.8 Constant Aperture |
| 82mm Filter Thread | AF with MF Switch |
| Nikon F Mount | Full-Frame Coverage |
| 520g Lens Weight | 89 x 87mm (D x L) |
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