Sigma 17-40mm f/1.8 DC vs 18-50mm f/2.8 DC DN Contemporary

Both are Canon RF zoom lenses for APS-C. Here is what actually differs.

Sigma

17-40mm f/1.8 DC

f/1.8

Full specs

Sigma · 2021

18-50mm f/2.8 DC DN Contemporary

f/2.8300 gStepping motor

Check price Full specs

Pick the 17-40mm f/1.8 DC if

You need 1⅓ stops more light for low light or background blur (f/1.8 vs f/2.8)
You want a wider view: 17mm vs 18mm at the wide end
You care about the shape of out-of-focus highlights: 11 aperture blades vs 7

Pick the 18-50mm f/2.8 DC DN Contemporary if

You need more reach: 50mm vs 40mm at the long end
You want bigger close-ups: 0.36× vs 0.21× maximum magnification

Spec differences

12 differences

Specifications that differ between the Sigma 17-40mm f/1.8 DC and the Sigma 18-50mm f/2.8 DC DN Contemporary
	17-40mm f/1.8 DC	18-50mm f/2.8 DC DN Contemporary
Focal length	17-40mm	18-50mm
Max aperture	f/1.8 1⅓ stops faster	f/2.8
Weight	not listed	300 g
Length	not listed	74.5 mm
Diameter	not listed	69.2 mm
Filter thread	not listed	55 mm
Min focus distance	0.28 m	not listed
Max magnification	0.21×	0.36× larger
Aperture blades	11 more blades	7
Optical design	17 elements / 11 groups	not listed
Autofocus motor	not listed	Stepping motor
Released	not listed	2021

5 identical specs hidden: brand, mount, type, format, image stabilization. Show all

Brand: Sigma both
Mount: Canon RF both
Type: Zoom both
Format: APS-C both
Image stabilization: No both

Our notes

Sigma 17-40mm f/1.8 DC

This 17-40mm f/1.8 APS-C fast wide-angle zoom lens from Sigma fits Canon RF mount cameras. It covers wide angles for landscapes, interiors and architecture.

Our notes