Tamron AF 28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro 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

AF 28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro

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.
Sigma 17-50mm f/2.8 EX DC OS HSM goes wider (17mm vs 28mm).
Tamron AF 28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro reaches further (300mm vs 50mm).

Specification comparison
Spec	AF 28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro	17-50mm f/2.8 EX DC OS HSM
Brand	Tamron	Sigma
Mount	Pentax K	Pentax K
Type	Zoom	Zoom
Focal length	28-300mm	17-50mm (wider)
Max aperture	f/3.5	f/2.8 (faster)
Filter mm	62	77
Min focus m	0.49	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
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 AF 28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro

The Tamron AF 28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro is a full-frame superzoom lens covering 28-300mm at f/3.5-6.3 for Pentax K mount cameras, with aspherical elements. A high-ratio travel zoom covering wide-angle to telephoto in one lens.

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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