Pentax HD PENTAX-D FA 15-30mm F2.8 ED SDM 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 15-30mm F2.8 ED SDM WR

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 lighter by 475g.
Pentax HD PENTAX-D FA 15-30mm F2.8 ED SDM WR goes wider (15mm vs 17mm).
Sigma 17-50mm f/2.8 EX DC OS HSM reaches further (50mm vs 30mm).

Specification comparison
Spec	HD PENTAX-D FA 15-30mm F2.8 ED SDM WR	17-50mm f/2.8 EX DC OS HSM
Brand	Pentax	Sigma
Mount	Pentax K	Pentax K
Type	Wide Zoom	Zoom
Focal length	15-30mm (wider)	17-50mm
Max aperture	f/2.8	f/2.8
Weight g	1040	565 (lighter)
Length mm	144.0	91.8
Diameter mm	99.0	83.5
Min focus m	0.28	0.28
Blades	n/a	7
Format	n/a	aps-c
Groups	n/a	13
Af motor	n/a	HSM
Elements	n/a	17
Filter mm	n/a	77
Stabilized	n/a	Yes
Max magnification	n/a	0.2

Pentax HD PENTAX-D FA 15-30mm F2.8 ED SDM WR

A full-frame ultra-wide zoom for Pentax with a constant f/2.8 aperture, SDM focusing and weather resistance. It weighs about 1,040 g.

Pros

Constant f/2.8
SDM autofocus
Weather resistant
Close focus 0.28 m

Cons

Bulbous front element
No front filter thread
Heavy at about 1,040 g

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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