Canon RF 24-240mm f/4-6.3 IS USM vs Canon RF-S 18-45mm f/4.5-6.3 IS STM

Both are Canon RF mount zooms for travel and everyday — 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 24-240mm f/4-6.3 IS USM	Canon RF-S 18-45mm f/4.5-6.3 IS STM
Focal length	24-240mm	18-45mm
Max aperture	f/4-6.3	f/4.5-6.3
Type	zoom	zoom
Coverage	full-frame	APS-C
Mount	Canon RF	Canon RF

Which should you buy?

the Canon RF 24-240mm f/4-6.3 IS USM opens wider (f/4-6.3) — brighter in low light and more background blur
the Canon RF 24-240mm f/4-6.3 IS USM covers 24-240mm and the Canon RF-S 18-45mm f/4.5-6.3 IS STM covers 18-45mm — pick the range that matches what you shoot
the Canon RF 24-240mm f/4-6.3 IS USM covers full-frame (also works on APS-C bodies); the Canon RF-S 18-45mm f/4.5-6.3 IS STM is APS-C-only — it won't fill a full-frame sensor

Where to buy

Canon RF 24-240mm F4-6.3 is USM Lens (RF)

Canon RF 24-240mm f/4-6.3 IS USMSee price on Amazon

Amazon links are affiliate links — we may earn a commission at no extra cost to you.

Canon EOS R50 Mirrorless Camera with RF-S18-45mm F4.5-6.3 is STM & RF-S55-210mm F5-7.1 is STM Lenses, 24.2 Megapixel CMO

Canon RF-S 18-45mm f/4.5-6.3 IS STMSee price on Amazon

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Affiliate links never affect our specs or which lenses we compare.

FAQ

What's the difference between the Canon RF 24-240mm f/4-6.3 IS USM and the Canon RF-S 18-45mm f/4.5-6.3 IS STM?
The Canon RF 24-240mm f/4-6.3 IS USM is 24-240mm f/4-6.3 zoom, full-frame; the Canon RF-S 18-45mm f/4.5-6.3 IS STM is 18-45mm f/4.5-6.3 zoom, APS-C. Both fit the Canon RF mount.

Which is better in low light, the Canon RF 24-240mm f/4-6.3 IS USM or the Canon RF-S 18-45mm f/4.5-6.3 IS STM?
The Canon RF 24-240mm f/4-6.3 IS USM — its f/4-6.3 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 24-240mm f/4-6.3 IS USM and Canon RF-S 18-45mm 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). Note the Canon RF-S 18-45mm f/4.5-6.3 IS STM 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:

More Canon RF comparisons: Canon RF 28mm f/2.8 STM vs Canon RF 50mm f/1.8 STM · Canon RF 35mm f/1.8 Macro IS STM vs Canon RF 85mm f/2 Macro IS STM · Canon RF 24-240mm f/4-6.3 IS USM vs Canon RF 24-105mm f/2.8 L IS USM · Canon RF 24-240mm f/4-6.3 IS USM vs Canon RF 24-105mm f/4-7.1 IS STM · all Canon RF lenses · all comparisons

Canon RF 24-240mm f/4-6.3 IS USMAffiliate linkSee price on Amazon