Sigma 20mm f/1.8 EX DG DF RF Pentax-k

$519
20 mm
autofocus prime lens
f/1.8

reviewswhat are people saying


Rated 5 out of 5 stars by 2 users at B&H Photo Video

"Highly recomemded for any wide angle needs, but specially f1.8 will give you way more light than the zooms in that range."

"I love it for low light photography, indoors without a flash, and to isolate the subject from the background."

"You are limited to 1 normal size filter (for 35mm film or a full frame CCD cameras)."

compatibilitywith digital cameras

APS-C (1.5x crop factor)

This lens is compatible with APS-C (1.5x crop factor) cameras such as the Pentax K-30, Pentax K-5 and Pentax K-5 II.

horizontal angle of view
61.3°
30.5mm
35mm equivalent focal length

Pros

The Sigma 20mm f/1.8 EX DG DF RF Pentax-k vs other Pentax K lenses

	Prime lens
	Typically very sharp

	Wide aperture
	f/1.8

The Sigma 20mm f/1.8 EX DG DF RF Pentax-k vs other Pentax K low light lenses

	Supports autofocus
	Easier to use

Cons

The Sigma 20mm f/1.8 EX DG DF RF Pentax-k vs other Pentax K lenses

	Poor telephoto lens
	20 mm

	Below average zoom range
	1x

	Lacks a silent focus motor
	Louder and slower

Specifications

General

	Min focal length	20 mm
	Max focal length	20 mm	below average
	Zoom range	1x	below average
	Magnification	1:4 (0.2x)
Aperture

	Wide minimum	f/1.8	above average
	Wide maximum	f/22
	Tele minimum	f/1.8	above average
	Tele maximum	f/22
Features

	Auto focus	Yes
	Focus motor	None	below average
	Image stabilization	None
	Fisheye	No
	Tilt-shift	No
Form factor

	Lens mount	Pentax K
	Length	86 mm
	Diameter	89 mm
	Filter size	82 mm
	Weight	0.5 kg
Angle of view

	Wide horizontal	61.1°
	Telephoto horizontal	61.1°	below average
	Wide vertical	42.9°
	Telephoto vertical	42.9°	below average
	Wide diagonal	70.6°
	Telephoto diagonal	70.6°	below average

DiscussionWhat do you think about the Sigma 20mm f/1.8 EX DG DF RF Pentax-k lens?

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Sigma 20mm f/1.8 EX DG DF RF Pentax-k

reviewswhat are people saying

compatibilitywith digital cameras

APS-C (1.5x crop factor)

Pros

The Sigma 20mm f/1.8 EX DG DF RF Pentax-k vs other Pentax K lenses

The Sigma 20mm f/1.8 EX DG DF RF Pentax-k vs other Pentax K low light lenses

Cons

The Sigma 20mm f/1.8 EX DG DF RF Pentax-k vs other Pentax K lenses

Specifications

General

Aperture

Features

Form factor

Angle of view

DiscussionWhat do you think about the Sigma 20mm f/1.8 EX DG DF RF Pentax-k lens?

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