Sigma 10-20mm f/4-5.6 EX DC HSM vs 8-16mm f/4.5-5.6 DC HSM

Both are Pentax K wide zoom lenses for APS-C. Here is what actually differs.

Sigma

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

f/4HSM

Full specs

Sigma

8-16mm f/4.5-5.6 DC HSM

f/4.5HSM

Full specs

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

You need ⅓ stop more light for low light or background blur (f/4 vs f/4.5)
You need more reach: 20mm vs 16mm at the long end
You want bigger close-ups: 0.15× vs 0.13× maximum magnification

Pick the 8-16mm f/4.5-5.6 DC HSM if

You want a wider view: 8mm vs 10mm at the wide end
You care about the shape of out-of-focus highlights: 7 aperture blades vs 6

Spec differences

6 differences

Specifications that differ between the Sigma 10-20mm f/4-5.6 EX DC HSM and the Sigma 8-16mm f/4.5-5.6 DC HSM
	10-20mm f/4-5.6 EX DC HSM	8-16mm f/4.5-5.6 DC HSM
Focal length	10-20mm	8-16mm
Max aperture	f/4 ⅓ stop faster	f/4.5
Filter thread	77 mm	not listed
Max magnification	0.15× larger	0.13×
Aperture blades	6	7 more blades
Optical design	14 elements / 10 groups	15 elements / 11 groups

7 identical specs hidden: brand, mount, type, format, min focus distance, autofocus motor, image stabilization. Show all

Brand: Sigma both
Mount: Pentax K both
Type: Wide Zoom both
Format: APS-C both
Min focus distance: 0.24 m both
Autofocus motor: HSM both
Image stabilization: No 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