Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) vs Sigma 24-70mm f/2.8 DG OS HSM Art

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

24-70mm f/2.8 DG OS HSM Art

Verdict at a glance

Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF) goes wider (17mm vs 24mm).
Sigma 24-70mm f/2.8 DG OS HSM Art reaches further (70mm vs 50mm).

Specification comparison
Spec	SP AF 17-50mm F/2.8 XR Di II LD Aspherical (IF)	24-70mm f/2.8 DG OS HSM Art
Brand	Tamron	Sigma
Mount	Pentax K	Pentax K
Type	Zoom	Zoom
Focal length	17-50mm (wider)	24-70mm
Max aperture	f/2.8	f/2.8
Format	aps-c	full-frame
Filter mm	67	82
Min focus m	0.27 (closer focusing)	0.37
Blades	n/a	9
Groups	n/a	14
Af motor	n/a	HSM
Elements	n/a	19
Length mm	n/a	107.6
Stabilized	n/a	Yes
Diameter mm	n/a	88.0
Max magnification	n/a	0.21

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 24-70mm f/2.8 DG OS HSM Art

A 24-70mm f/2.8 full-frame fast standard zoom lens, the Sigma 24-70mm f/2.8 DG OS HSM Art is designed for Pentax K mount bodies, from the Sigma Art line with Optical Stabilizer and Hyper Sonic Motor autofocus. A standard zoom from Sigma's Art line with a constant f/2.8 apertur...

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