Canon RF-S 10-18mm f/4.5-6.3 IS STM vs Canon RF 10-20mm f/4 L IS STM
Both are Canon RF mount zooms for wide-angle — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.
| Spec | Canon RF-S 10-18mm f/4.5-6.3 IS STM | Canon RF 10-20mm f/4 L IS STM |
|---|---|---|
| Focal length | 10-18mm | 10-20mm |
| Max aperture | f/4.5-6.3 | f/4 |
| Type | zoom | zoom |
| Coverage | APS-C | 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-S 10-18mm f/4.5-6.3 IS STM covers 10-18mm and the Canon RF 10-20mm f/4 L IS STM covers 10-20mm — pick the range that matches what you shoot
- the Canon RF 10-20mm f/4 L IS STM covers full-frame (also works on APS-C bodies); the Canon RF-S 10-18mm f/4.5-6.3 IS STM is APS-C-only — it won't fill a full-frame sensor
Where to buy
Check the Canon RF-S 10-18mm f/4.5-6.3 IS STM price on Amazon →
Check the Canon RF 10-20mm f/4 L IS STM price on Amazon →
FAQ
What's the difference between the Canon RF-S 10-18mm f/4.5-6.3 IS STM and the Canon RF 10-20mm f/4 L IS STM?
The Canon RF-S 10-18mm f/4.5-6.3 IS STM is 10-18mm f/4.5-6.3 zoom, APS-C; the Canon RF 10-20mm f/4 L IS STM is 10-20mm f/4 zoom, full-frame. Both fit the Canon RF mount.
Which is better in low light, the Canon RF-S 10-18mm f/4.5-6.3 IS STM or the Canon RF 10-20mm f/4 L 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-S 10-18mm f/4.5-6.3 IS STM and Canon RF 10-20mm f/4 L 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). Note the Canon RF-S 10-18mm f/4.5-6.3 IS STM is APS-C-only and won't fill a full-frame sensor.
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