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Canon RF 10–20mm F4 L IS STM vs Canon RF 20-50mm F4L IS USM PZ

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 20-50mm F4L IS USM PZ
Overview
ReleasedOctober 2023June 2026
Optics
Lens typeZoomZoom
Focal length10–20 mm20–50 mm
Maximum aperturef/4f/4
Minimum aperturef/22f/22
Optical constructionSixteen elements in twelve groups; designed for use with digital distortion correction13 elements in 11 groups
Special elementsOne Super UD, three UD and three glass-moulded aspherical elements; one element is both UD and asphericalTwo glass-moulded aspherical and three UD elements
CoatingsASC, Super Spectra and SWC coatings; front fluorine coatingASC and Super Spectra; fluorine coating on the front element
Aperture detail–Constant maximum f/4, minimum f/22 throughout the range
DiaphragmNine aperture bladesNine aperture blades
Angle of view130°25′–94° diagonal, 121°55′–84° horizontal and 100°25′–62° verticalHorizontal 84°–40°, vertical 62°–27° and diagonal 94°–46° 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; power-zoom control from camera body or remote devices depends on compatible model and firmware
Teleconverter supportNot compatible with Canon RF extendersCanon RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.25 m0.24 m
Maximum magnification0.12×0.33×
Optical stabilisationYesYes
Autofocus detailSTM autofocus optimised for smooth, near-silent focusing in stills and videoNano USM autofocus; full-time manual focus; maker rear-focus design retains length during focusing
Focus distance detailMinimum focus 0.25 m–
Magnification detailMaximum 0.12× at 20 mm and 0.06× at 10 mmMaker maximum magnification 0.14× at 20 mm or 0.33× at 50 mm; no AF/MF mode specified in the table
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 blurMaker six-stop optical IS or combined camera/lens eight stops at centre and corners under CIPA-2024, at maximum focal length with its specified camera; not guaranteed in every shooting setup
Video features–Internal multi-speed power zoom and optically suppressed focus breathing; zoom ring switches between powered and conventional manual operation
Design
Dust and moisture resistantYesYes
Filter diameter–67 mm
Maximum diameter83.7 mm79.9 mm
Length112 mm98.4 mm
Weight570 g420 g
ControlsSeparate zoom, focus and customisable control rings; customisable AF stop/function buttonCustomisable control ring, focus ring and zoom ring; PZ/MZ selector, custom button, AF/MF and stabiliser switches (Digital Camera World; ePHOTOzine)
Zoom design–Internal zoom/focus keeps barrel length fixed; ePHOTOzine describes conventional mechanical manual zoom, while Digital Camera World's prose calls it fly-by-wire; no silent choice between those reviewer descriptions
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 coatingDust and moisture resistant with mount gasket; maker warns camera attachment is required and protection cannot prevent all dust or water ingress; no waterproof/IP rating inferred
Dimensions detail83.7 mm maximum diameter × 112 mm lengthApproximately 79.9 mm maximum diameter × 98.4 mm length
Weight detailApproximately 570 g lensApproximately 420 g lens
Lens hoodBuilt-in lens hoodES-73B; maker lists E-67 II cap, Lens Dust Cap RF and LP1219 pouch as accessories
In the boxLens, RF dust cap, Lens Cap 10-20, LP1219 lens case and user manual–
Release detailOctober 2023 marketed month in Canon Camera MuseumCanon Japan's 11 June 2026 notice confirms first sale from 26 June 2026, resolving the earlier late-June launch wording

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