Canon RF 10-20mm f/4 L IS STM vs Canon RF 15-30mm f/4.5-6.3 IS STM

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 10-20mm f/4 L IS STM	Canon RF 15-30mm f/4.5-6.3 IS STM
Focal length	10-20mm	15-30mm
Max aperture	f/4	f/4.5-6.3
Type	zoom	zoom
Coverage	full-frame	full-frame
Mount	Canon RF	Canon RF

Which should you buy?

the Canon RF 10-20mm f/4 L IS STM opens wider (f/4) — brighter in low light and more background blur
the Canon RF 10-20mm f/4 L IS STM covers 10-20mm and the Canon RF 15-30mm f/4.5-6.3 IS STM covers 15-30mm — pick the range that matches what you shoot

Where to buy

Canon RF10-20mm F4 L is STM, Ultra-Wide-Angle Lens for Full-Frame Cameras, Compact & Lightweight, Great for Still Photog

Check the Canon RF 10-20mm f/4 L IS STM price on Amazon →

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Check the Canon RF 15-30mm f/4.5-6.3 IS STM price on Amazon → We could not find this one on Amazon US in Canon RF — this button runs an Amazon search for it rather than opening a product page.

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FAQ

What's the difference between the Canon RF 10-20mm f/4 L IS STM and the Canon RF 15-30mm f/4.5-6.3 IS STM?
The Canon RF 10-20mm f/4 L IS STM is 10-20mm f/4 zoom, full-frame; the Canon RF 15-30mm f/4.5-6.3 IS STM is 15-30mm f/4.5-6.3 zoom, full-frame. Both fit the Canon RF mount.

Which is better in low light, the Canon RF 10-20mm f/4 L IS STM or the Canon RF 15-30mm f/4.5-6.3 IS STM?
The Canon RF 10-20mm f/4 L IS STM — its f/4 maximum aperture lets in more light and gives more background blur than the f/4.5-6.3 of the other.

Do the Canon RF 10-20mm f/4 L IS STM and Canon RF 15-30mm f/4.5-6.3 IS STM 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).

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

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