Canon RF 15-35mm f/2.8 L IS USM vs Sigma 10-18mm f/2.8 DC DN Contemporary

Both are Canon RF mount zooms for wide-angle and landscape — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.

Last verified 2026-09-01 · Canon RF mount · prices change — check the retailer

Spec	Canon RF 15-35mm f/2.8 L IS USM	Sigma 10-18mm f/2.8 DC DN Contemporary
Focal length	15-35mm	10-18mm
Max aperture	f/2.8	f/2.8
Type	zoom	zoom
Coverage	full-frame	APS-C
Mount	Canon RF	Canon RF

Which should you buy?

the Canon RF 15-35mm f/2.8 L IS USM covers 15-35mm and the Sigma 10-18mm f/2.8 DC DN Contemporary covers 10-18mm — pick the range that matches what you shoot
the Canon RF 15-35mm f/2.8 L IS USM covers full-frame (also works on APS-C bodies); the Sigma 10-18mm f/2.8 DC DN Contemporary is APS-C-only — it won't fill a full-frame sensor
the Canon RF 15-35mm f/2.8 L IS USM is first-party (Canon) for guaranteed full autofocus and in-camera corrections; the Sigma 10-18mm f/2.8 DC DN Contemporary is third-party — usually the value pick

Where to buy

Canon RF 15-35mm f/2.8 L IS USMSee price on Amazon

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Sigma 10-18mm f/2.8 DC DN ContemporarySee price on Amazon

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FAQ

What's the difference between the Canon RF 15-35mm f/2.8 L IS USM and the Sigma 10-18mm f/2.8 DC DN Contemporary?
The Canon RF 15-35mm f/2.8 L IS USM is 15-35mm f/2.8 zoom, full-frame; the Sigma 10-18mm f/2.8 DC DN Contemporary is 10-18mm f/2.8 zoom, APS-C. Both fit the Canon RF mount.

Do the Canon RF 15-35mm f/2.8 L IS USM and Sigma 10-18mm f/2.8 DC DN Contemporary fit the same camera?
Yes — both are Canon RF mount lenses, so they fit Canon EOS R series (full-frame R5/R6/R8) and APS-C (R7/R10/R50). Note the Sigma 10-18mm f/2.8 DC DN Contemporary is APS-C-only and won't fill a full-frame sensor.

Citing these specs? Go ahead — manufacturer data, last verified 2026-09-01. Copy a ready-made reference:

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Canon RF 15-35mm f/2.8 L IS USMAffiliate linkSee price on Amazon