Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM vs Sigma 17-70mm f/2.8-4 DC Macro 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

17-70mm f/2.8-4 DC Macro OS HSM

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Verdict at a glance

Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM goes wider (16mm vs 17mm).
Sigma 17-70mm f/2.8-4 DC Macro OS HSM reaches further (70mm vs 50mm).

Specification comparison
Spec	smc DA* 16-50mm F2.8 ED AL (IF) SDM	17-70mm f/2.8-4 DC Macro OS HSM
Brand	Pentax	Sigma
Mount	Pentax K	Pentax K
Type	Zoom	Macro
Focal length	16-50mm (wider)	17-70mm
Max aperture	f/2.8	f/2.8
Format	aps-c	n/a
Weight g	565	n/a
Filter mm	77	n/a
Length mm	99.0	n/a
Diameter mm	84.0	n/a
Min focus m	0.3	n/a

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 17-70mm f/2.8-4 DC Macro OS HSM

Sigma 17-70mm f/2.8-4 DC Macro OS HSM: an APS-C macro zoom lens with a 17-70mm focal length and a maximum aperture of f/2.8-4, made for Pentax K mount cameras, with Optical Stabilizer and Hyper Sonic Motor autofocus. It is intended for close-up work with small subjects such as...

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