Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k

$669
17-50 mm
autofocus 2.9x zoom lens
f/2.8
fixed aperture Sigma OS Image stabilized Sigma HSM Built in focus motor

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
69.8 - 26.7°
26-76mm
35mm equivalent focal length

Pros

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K lenses

	Fixed aperture
	The same aperture at all focal lengths

	More advanced image stabilization
	Sigma OS

	Silent focus motor
	Silent and fast

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K wide angle lenses

	Wide aperture
	f/2.8

Cons

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K lenses

	Zoom lens
	Typically not as sharp as prime lenses

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K wide angle lenses

	Below average zoom range
	2.9x

Specifications

General

	Min focal length	17 mm
	Max focal length	50 mm	below average
	Zoom range	2.9x
	Magnification	Unknown
Aperture

	Wide minimum	f/2.8
	Wide maximum	f/22
	Tele minimum	f/2.8	above average
	Tele maximum	f/22
Features

	Auto focus	Yes
	Focus motor	Sigma HSM	above average
	Image stabilization	Sigma OS	above average
	Fisheye	No
	Tilt-shift	No
Form factor

	Lens mount	Pentax K
	Length	Unknown
	Diameter	Unknown
	Filter size	77 mm
	Weight	0.6 kg
Angle of view

	Wide horizontal	69.5°
	Telephoto horizontal	26.6°
	Wide vertical	49.6°
	Telephoto vertical	17.8°
	Wide diagonal	79.6°
	Telephoto diagonal	31.7°

DiscussionWhat do you think about the Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k lens?

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Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k

compatibilitywith digital cameras

APS-C (1.5x crop factor)

Pros

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K lenses

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K wide angle lenses

Cons

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K lenses

The Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k vs other Pentax K wide angle lenses

Specifications

General

Aperture

Features

Form factor

Angle of view

DiscussionWhat do you think about the Sigma 17-50mm f/2.8 EX DC OS HSM Pentax-k lens?

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