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Sigma 20mm F1.8 EX DG ASP RF Lens
For Nikon F Mount

Fixed focal-length. No zoom.Fixed focal-length. No zoom.Rectilinear are normal lenses that show straight lines as straight lines.Rectilinear are normal lenses that show straight lines as straight lines.Thread size in milimeters for screw-on filters.Thread size in milimeters for screw-on filters.82Autofocus LensAutofocus Lens

Lens Description

The Sigma 20mm F1.8 EX DG ASP RF is an ultra-wide prime designed for cameras with Full-Frame sensors. This ultra-bright prime has a 20mm focal-length.

This prime is capable of focusing down to 20cm from the imaging plane which gives it a maximum magnification of 0.25X. 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.

This version has a Nikon F lens mount. Follow this link to see all current compatible digital cameras: Nikon F mount cameras with Full-Frame or larger sensor. Sigma also made this lens available for Canon EF, Pentax K, Sony A, Sigma S mounts.

Sigma 20mm F1.8 EX DG ASP RF

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 ApertureF/1.8Min ApertureF/22
Min Focus20cmMagnification0.25X
Filter Size82mm Aperture Blades9
Size (D x L)89 x 87mm Weight520g
TiltN / A ShiftN / A
Stabilization ProtectionNone
Zoom Drive N / A Focus Drive AF with MF switch
Zoom Mechanism N / A Focus Mechanism Internal
Hood Bayonet Focus Motor Internal
Perspective RectilinearIntroduced

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Sigma 20mm F/1.8 Facts


Fixed focal-length. No zoom.Fixed focal-length. No zoom.Rectilinear are normal lenses that show straight lines as straight lines.Rectilinear are normal lenses that show straight lines as straight lines.Thread size in milimeters for screw-on filters.Thread size in milimeters for screw-on filters.82Autofocus LensAutofocus Lens
20mm Focal-Length F/1.8 Constant Aperture
82mm Filter Thread AF with MF switch
Nikon F Mount 1 Max Crop-Factor
520g Lens Weight 89 x 87mm (D x L)
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