Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM vs Sigma 17-50mm f/2.8 EX DC OS HSM

Side-by-side comparison from our catalogue data. Better values are highlighted only where a clear difference exists.

Pentax

smc DA* 16-50mm F2.8 ED AL (IF) SDM

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Sigma

17-50mm f/2.8 EX DC OS HSM

Verdict at a glance

Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM goes wider (16mm vs 17mm).

Specification comparison
Spec	smc DA* 16-50mm F2.8 ED AL (IF) SDM	17-50mm f/2.8 EX DC OS HSM
Brand	Pentax	Sigma
Mount	Pentax K	Pentax K
Type	Zoom	Zoom
Focal length	16-50mm (wider)	17-50mm
Max aperture	f/2.8	f/2.8
Format	aps-c	aps-c
Weight g	565	565
Filter mm	77	77
Length mm	99.0	91.8
Diameter mm	84.0	83.5
Min focus m	0.3	0.28 (closer focusing)
Blades	n/a	7
Groups	n/a	13
Af motor	n/a	HSM
Elements	n/a	17
Stabilized	n/a	Yes
Max magnification	n/a	0.2

Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM

A constant f/2.8 standard zoom for Pentax APS-C bodies, with SDM focusing. It weighs about 565 g and takes 77mm filters.

Pros

Constant f/2.8
SDM autofocus
Weather-resistant build
77mm filters

Cons

APS-C only
SDM motors in some units have failed with age
No lens stabilization

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

Sigma 17-50mm f/2.8 EX DC OS HSM: an APS-C fast standard zoom lens with a 17-50mm focal length and a maximum aperture of f/2.8, made for Pentax K mount cameras, with Optical Stabilizer and Hyper Sonic Motor autofocus. A bright standard zoom for APS-C cameras with a constant f/...

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