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Canon RF 10–20mm F4 L IS STM vs Canon RF 45mm F1.2 STM

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 45mm F1.2 STM
Overview
ReleasedOctober 2023November 2025
Optics
Lens typeZoomPrime
Focal length10–20 mm45 mm
Maximum aperturef/4f/1.2
Minimum aperturef/22f/16
Optical constructionSixteen elements in twelve groups; designed for use with digital distortion correctionNine elements in seven groups
Special elementsOne Super UD, three UD and three glass-moulded aspherical elements; one element is both UD and asphericalOne plastic-moulded aspherical element (Canon USA)
CoatingsASC, Super Spectra and SWC coatings; front fluorine coatingSuper Spectra coating
Aperture detail–f/1.2–16
DiaphragmNine aperture bladesNine aperture blades
Angle of view130°25′–94° diagonal, 121°55′–84° horizontal and 100°25′–62° vertical43°35′ horizontal, 29°50′ vertical and 51°20′ diagonal on full frame
ProjectionRectilinear–
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityCanon RF mount for full-frame and APS-C EOS R camerasCanon EOS R cameras; full-frame image circle
Teleconverter supportNot compatible with Canon RF extendersCanon RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.25 m0.45 m
Maximum magnification0.12×0.13×
Optical stabilisationYesNo
Autofocus detailSTM autofocus optimised for smooth, near-silent focusing in stills and videoGear-type STM autofocus with magnetic focus-position detection; full-time electronic manual focus
Focus distance detailMinimum focus 0.25 mMinimum focusing distance 0.45 m; Canon does not separately specify AF/MF distances
Magnification detailMaximum 0.12× at 20 mm and 0.06× at 10 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 optical image stabilisation (Canon USA)
Design
Dust and moisture resistantYesNo
Filter diameter–67 mm
Maximum diameter83.7 mm78 mm
Length112 mm75 mm
Weight570 g346 g
ControlsSeparate zoom, focus and customisable control rings; customisable AF stop/function buttonSeparate focus and clickable control rings; AF/MF switch; no iris ring or lens function button (Canon USA)
Filter detailNo front filter thread; rear holder accepts 35 × 20 mm gelatine filters67 mm front screw-in filter thread
Weather resistanceDust and moisture resistant construction with front fluorine coatingNo dust or weather resistant construction (Canon USA)
Dimensions detail83.7 mm maximum diameter × 112 mm lengthApproximately 78 mm maximum diameter × 75 mm length
Weight detailApproximately 570 g lensApproximately 346 g lens
Lens hoodBuilt-in lens hoodOptional ES-73B hood and LP1116 case; E-67 II front cap and Lens Dust Cap RF listed by Canon
In the boxLens, RF dust cap, Lens Cap 10-20, LP1219 lens case and user manualFront and rear lens caps (Amateur Photographer); hood not included
Release detailOctober 2023 marketed month in Canon Camera MuseumCanon Japan's 14 November 2025 notice confirms first sale on 28 November 2025; Photography Blog instead reports availability from 20 November without a matching regional maker day, so no UK date is inferred

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