Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) 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.

Tamron

SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)

Sigma

17-50mm f/2.8 EX DC OS HSM

Specification comparison
Spec	SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)	17-50mm f/2.8 EX DC OS HSM
Brand	Tamron	Sigma
Mount	Pentax K	Pentax K
Type	Zoom	Zoom
Focal length	17-50mm	17-50mm
Max aperture	f/2.8	f/2.8
Format	aps-c	aps-c
Filter mm	67	77
Min focus m	0.27 (closer focusing)	0.28
Blades	n/a	7
Groups	n/a	13
Af motor	n/a	HSM
Elements	n/a	17
Weight g	n/a	565
Length mm	n/a	91.8
Stabilized	n/a	Yes
Diameter mm	n/a	83.5
Max magnification	n/a	0.2

Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)

A popular APS-C standard zoom with a constant f/2.8 aperture, much used on Pentax bodies with in-body stabilization. It has a 67mm filter thread and a minimum focus distance of 0.27 m.

Pros

Constant f/2.8
Compact 67mm filter size
Constant aperture with in-body stabilization support
Works with Pentax in-body stabilization

Cons

APS-C only
No weather sealing
Plastic build

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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