Pentax HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR 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

HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR

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Sigma

17-50mm f/2.8 EX DC OS HSM

Verdict at a glance

Sigma 17-50mm f/2.8 EX DC OS HSM is faster by 0.6 stops (f/2.8 vs f/3.5), letting in more light.
Pentax HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR is lighter by 125g.
Sigma 17-50mm f/2.8 EX DC OS HSM goes wider (17mm vs 28mm).
Pentax HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR reaches further (105mm vs 50mm).

Specification comparison
Spec	HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR	17-50mm f/2.8 EX DC OS HSM
Brand	Pentax	Sigma
Mount	Pentax K	Pentax K
Type	Zoom	Zoom
Focal length	28-105mm	17-50mm (wider)
Max aperture	f/3.5	f/2.8 (faster)
Weight g	440 (lighter)	565
Filter mm	62	77
Length mm	87.0	91.8
Diameter mm	73.0	83.5
Min focus m	0.5	0.28 (closer focusing)
Blades	n/a	7
Format	n/a	aps-c
Groups	n/a	13
Af motor	n/a	HSM
Elements	n/a	17
Stabilized	n/a	Yes
Max magnification	n/a	0.2

Pentax HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR

A compact full-frame standard zoom for Pentax with weather resistance and a quiet DC motor. It weighs about 440 g and takes 62mm filters.

Pros

Light at about 440 g
Weather resistant
Quiet DC motor
Useful 28-105mm range

Cons

Slow variable aperture
Not suited to low light
Plastic body

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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