Sigma 17-40mm f/1.8 DC vs 10-18mm f/2.8 DC DN Contemporary

Both are Fujifilm X lenses for APS-C. Here is what actually differs.

Sigma · 2025

17-40mm f/1.8 DC

f/1.8530 g

Full specs

Sigma · 2023

10-18mm f/2.8 DC DN Contemporary

f/2.8250 gStepping motor

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 need more reach: 40mm vs 18mm at the long end
You care about the shape of out-of-focus highlights: 11 aperture blades vs 7
You prefer a newer design: released 2025 vs 2023

Pick the 10-18mm f/2.8 DC DN Contemporary if

You want the lighter lens to carry: 280 g lighter (250 g vs 530 g)
You want a wider view: 10mm vs 17mm at the wide end
You want bigger close-ups: 0.25× vs 0.21× maximum magnification
You want a compact lens: 64.3 mm vs 118.2 mm long

Spec differences

12 differences

Specifications that differ between the Sigma 17-40mm f/1.8 DC and the Sigma 10-18mm f/2.8 DC DN Contemporary
	17-40mm f/1.8 DC	10-18mm f/2.8 DC DN Contemporary
Type	Zoom	Wide Zoom
Focal length	17-40mm	10-18mm
Max aperture	f/1.8 1⅓ stops faster	f/2.8
Weight	530 g	250 g lighter
Length	118.2 mm	64.3 mm shorter
Diameter	72.9 mm	72.2 mm
Min focus distance	0.28 m	not listed
Max magnification	0.21×	0.25× larger
Aperture blades	11 more blades	7
Optical design	17 elements / 11 groups	13 elements / 10 groups
Autofocus motor	not listed	Stepping motor
Released	2025	2023

6 identical specs hidden: brand, mount, format, filter thread, image stabilization, weather sealing. Show all

Brand: Sigma both
Mount: Fujifilm X both
Format: APS-C both
Filter thread: 67 mm both
Image stabilization: No both
Weather sealing: Yes 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 Fujifilm X mount cameras. It covers wide angles for landscapes, interiors and architecture.

Our notes