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Sigma 20mm F1.8 EX DG Aspherical RF Pentax KAF Review
Sigma 20mm F1.8 EX DG Aspherical RF

Main Features

  • 20mm Focal Range
  • F1.8 Max Aperture
  • Filter Thread: 82mm
  • Max Format: 35mm FF
  • Pentax KAF Mount
  • Weight: 520g.
  • Diameter: 89mm
  • Length: 90mm
  • Min Focus Distance:0.2m
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Sigma 20mm F1.8 EX DG RF Overview
Sigma 20mm F1.8 EX DG RF is an Auto Focus (AF) Wideangle Prime lens with 35mm FF max sensor coverage and it is designed to be used with Pentax KAF mount cameras.

Lens Mount

Sigma 20mm F1.8 EX DG RF is compatible with cameras that have Pentax KAF lens mount.Some of the latest released cameras with Pentax KAF lens mount are Pentax K-1 II, Pentax KP and Pentax K-70.

Sensor Coverage

Max sensor coverage of Sigma 20mm F1.8 EX DG RF is 35mm FF.

Focal Range

Sigma 20mm F1.8 EX DG RF has a fixed focal lenght of 20mm. When mounted on a 35mm FF format camera, it provides an 35mm (FF) equivalent of 20mm.

Body Colour

Black

Aperture

Sigma 20mm F1.8 EX DG RF has a max aperture of F1.8 and a minimum aperture of F22.0.
Pros and Cons of Sigma 20mm F1.8 EX DG Aspherical RF

PROs
Built-in Autofocus
Hood supplied
Full-time Manual Focusing
Fast Aperture
Covers Full-Frame Sensor

CONs

We couldn't find any significant Cons for Sigma 20mm F1.8 EX DG Aspherical RF

Sigma 20mm F1.8 EX DG RF Detailed Specifications

General
Brand Sigma
Lens Type Prime
Lens Type Wideangle Prime
Lens Mount Pentax KAF
Max Format 35mm FF
Focal Range 20mm
Image Stabilization No
Colour Black
Zoom Method No Zoom
Power Zoom No Zoom
Zoom Lock No Zoom
Zoom Ratio 1.0X
APERTURE
Max Aperture F1.8
Min Aperture F22.0
Aperture Ring Yes
Diaphragm Blades 9
Optics
Optical Elements 13
Optical Groups 11
Special Elements 2 aspherical elements

FOCUSING
Min Focus Distance 0.2m
Max Magnification unknown
Autofocus Yes
AF Motor Type unknown
Full Time Manual Yes
Focus Method Rear
Distance Scale Yes
DoF Scale Yes
PHYSICAL SPECS
Weight 520g
Diameter 89mm
Length 90mm
Weather Sealing Unknown
Filter Thread 82mm
Filter Notes -
Hood Supplied Yes
Hood Code petal type hood
Tripod Collar No
Sigma 20mm F1.8 EX DG Aspherical RF Alternatives in Pentax KAF Mount
Model Coverage Weight Focusing Street Price
HD Pentax DA 21mm F3.2 AL Limited Lens HD Pentax DA 21mm F3.2 AL Limited
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Frequently Asked Questions about Sigma 20mm F1.8 EX DG Aspherical RF
is the Sigma 20mm F1.8 EX DG Aspherical RF a Weather Sealed lens?
What is the Minimum Focusing Distance of Sigma 20mm F1.8 EX DG Aspherical RF
is the Sigma 20mm F1.8 EX DG Aspherical RF an Autofocus (AF) lens?
What is the Filter Thread Size of Sigma 20mm F1.8 EX DG Aspherical RF
Does Sigma 20mm F1.8 EX DG Aspherical RF have Image Stabilization?
Does Sigma 20mm F1.8 EX DG Aspherical RF have Aperture Ring?
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