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Canon RF 10–20mm F4 L IS STM vs Canon RF 75–300mm F4–5.6

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

CanonRF 10–20mm F4 L IS STMCanonRF 75–300mm F4–5.6
Overview
ReleasedOctober 2023May 2025
Optics
Lens typeZoomZoom
Focal length10–20 mm75–300 mm
Maximum aperturef/4f/4–5.6
Minimum aperturef/22f/32–45
Optical constructionSixteen elements in twelve groups; designed for use with digital distortion correctionThirteen elements in nine groups; Canon states the optical design is adapted from the EF 75–300mm F4–5.6 III
Special elementsOne Super UD, three UD and three glass-moulded aspherical elements; one element is both UD and aspherical–
CoatingsASC, Super Spectra and SWC coatings; front fluorine coatingSuper Spectra; no fluorine coating
Aperture detail–Maximum f/4 at 75 mm and f/5.6 at 300 mm; minimum f/32 and f/45 respectively
DiaphragmNine aperture bladesSeven blades
Angle of view130°25′–94° diagonal, 121°55′–84° horizontal and 100°25′–62° verticalFull-frame diagonal 32°11′–8°15′; horizontal 27°–6°50′; vertical 18°11′–4°35′
ProjectionRectilinear–
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityCanon RF mount for full-frame and APS-C EOS R camerasCanon RF mount for full-frame and APS-C EOS R cameras; 120–480 mm equivalent field of view on Canon APS-C
Teleconverter supportNot compatible with Canon RF extendersNot compatible with RF extenders (The-Digital-Picture)
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.25 m1.5 m
Maximum magnification0.12×0.25×
Optical stabilisationYesNo
Autofocus detailSTM autofocus optimised for smooth, near-silent focusing in stills and videoDC motor autofocus; no full-time manual focus override (Digital Camera World)
Focus distance detailMinimum focus 0.25 m1.5 m minimum focus; front element and focus ring rotate during focusing (Digital Camera World and The-Digital-Picture)
Magnification detailMaximum 0.12× at 20 mm and 0.06× at 10 mm0.06× at 75 mm and 0.25× at 300 mm
Stabilisation detailUp to five stops optical stabilisation tested with EOS R at 20 mm, or six stops coordinated stabilisation with EOS R3 at 20 mm; CIPA yaw and pitch testing. Peripheral Coordinated Control IS also compensates for peripheral blurNo lens optical stabilisation
Video features–Substantial focus breathing in The-Digital-Picture's test
Design
Filter diameter–58 mm
Dust and moisture resistantYes–
Maximum diameter83.7 mm71.2 mm
Length112 mm146.1 mm
Weight570 g507 g
ControlsSeparate zoom, focus and customisable control rings; customisable AF stop/function buttonManual focus and zoom rings, AF/MF switch; no custom control ring (The-Digital-Picture)
Zoom design–Extending zoom barrel; further extension and front rotation during focusing (Digital Camera World)
Filter detailNo front filter thread; rear holder accepts 35 × 20 mm gelatine filters58 mm front thread rotates during focusing
Weather resistanceDust and moisture resistant construction with front fluorine coatingCanon UK's table lists dust/moisture resistance, but Digital Camera World and The-Digital-Picture both report no weather sealing
Dimensions detail83.7 mm maximum diameter × 112 mm length71.2 mm maximum diameter × 146.1 mm retracted length
Weight detailApproximately 570 g lensApproximately 507 g lens
Lens hoodBuilt-in lens hoodOptional ET-60 hood, not included
In the boxLens, RF dust cap, Lens Cap 10-20, LP1219 lens case and user manualLens, E-58 II lens cap, RF dust cap and user manual
Release detailOctober 2023 marketed month in Canon Camera MuseumMay 2025 release confirmed retrospectively by Canon's February 2026 press release and Canon Camera Museum

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