Sigma 10-20mm f/4-5.6 EX DC HSM vs Tamron 18-270mm f/3.5-6.3 Di II PZD

Both are Pentax K lenses. Here is what actually differs.

Sigma

Pick the Sigma 10-20mm f/4-5.6 EX DC HSM if

You want a wider view: 10mm vs 18mm at the wide end

Pick the Tamron 18-270mm f/3.5-6.3 Di II PZD if

You need ⅓ stop more light for low light or background blur (f/3.5 vs f/4)
You need more reach: 270mm vs 20mm at the long end

Spec differences

12 differences

Specifications that differ between the Sigma 10-20mm f/4-5.6 EX DC HSM and the Tamron 18-270mm f/3.5-6.3 Di II PZD
	Sigma 10-20mm f/4-5.6 EX DC HSM	Tamron 18-270mm f/3.5-6.3 Di II PZD
Brand	Sigma	Tamron
Type	Wide Zoom	Superzoom
Format	APS-C	not listed
Focal length	10-20mm	18-270mm
Max aperture	f/4	f/3.5 ⅓ stop faster
Filter thread	77 mm	not listed
Min focus distance	0.24 m	not listed
Max magnification	0.15×	not listed
Aperture blades	6	not listed
Optical design	14 elements / 10 groups	not listed
Autofocus motor	HSM	not listed
Image stabilization	No	not listed

1 identical spec hidden: mount. Show all

Mount: Pentax K both

Our notes

Sigma 10-20mm f/4-5.6 EX DC HSM

This 10-20mm f/4-5.6 APS-C wide-angle zoom lens from Sigma fits Pentax K mount cameras, with Hyper Sonic Motor autofocus. It covers wide angles for landscapes, interiors and architecture.

Our notes

Tamron 18-270mm f/3.5-6.3 Di II PZD

A 18-270mm f/3.5-6.3 APS-C superzoom lens, the Tamron 18-270mm f/3.5-6.3 Di II PZD is designed for Pentax K mount bodies, with quiet motor-driven autofocus. A high-ratio travel zoom covering wide-angle to telephoto in one lens.