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Canon RF 20mm F1.4 L VCM vs Canon RF-S 10–18mm F4.5–6.3 IS STM

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

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CanonRF 20mm F1.4 L VCMCanonRF-S 10–18mm F4.5–6.3 IS STM
Overview
ReleasedApril 2025November 2023
Optics
Lens typePrimeZoom
Focal length20 mm10–18 mm
Maximum aperturef/1.4f/4.5–6.3
Minimum aperturef/16f/22–32
Optical constructionFifteen elements in eleven groupsTwelve elements in ten groups
Special elementsOne Super UD, two UD, one BR and two glass-moulded aspherical elements; ASC, SWC and Super Spectra coatings; front fluorine coatingTwo UD elements and one plastic-moulded aspherical element; Super Spectra coating
Aperture detail–Maximum f/4.5 at 10 mm and f/6.3 at 18 mm; minimum f/22–32
DiaphragmEleven blades with circular apertureSeven blades
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameAPS-C
CompatibilityCanon RF mount for full-frame and APS-C EOS R cameras; RF extenders not compatible. Iris ring provides movie aperture control; Canon lists EOS R, RP, Ra, R3, R5, R6, R6 Mark II, R7, R8, R10, R50, R100 and R5 C as unable to set still-photo aperture with this ring even with their latest firmwareCanon RF mount with APS-C image circle; full-frame EOS R bodies crop to APS-C; RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.2 m0.086 m (manual focus)
Maximum magnification0.19×0.5× (manual focus)
Optical stabilisationNoYes
Autofocus detailRear focusing system driven by a VCM motorLead-screw STM autofocus and electronic manual focusing; supports compatible cameras' electronic movie focus-breathing correction
Focus distance detailMinimum focus 0.2 mAutofocus minimum 0.14 m throughout 10–18 mm; manual-focus minimum 0.086 m at 10 mm
Magnification detailMaximum 0.19×Autofocus maximum 0.23× at 18 mm; manual-focus maximum 0.5× at 10 mm
Stabilisation detailNo optical stabiliser; Canon rates EOS R1 in-body stabilisation at 8 stops centrally and 5 stops in the corners under CIPA-2024 testingOptical IS rated four stops with EOS R10 at 18 mm under CIPA, yaw/pitch; coordinated IS rated six stops with EOS R7 at 18 mm under CIPA, yaw/pitch
Design
Dust and moisture resistantYesNo
Filter diameter67 mm49 mm
Maximum diameter76.5 mm69 mm
Length99.3 mm44.9 mm
Weight519 g150 g
ControlsElectronic manual-focus, customisable control and smooth-action iris rings; iris Auto-position lock; customisable lens function button; AF/MF switchCombined focus/control ring and zoom ring; AF/MF and IS controlled through camera settings
Zoom design–Retractable barrel; lens must be extended for shooting; designed to use camera electronic distortion correction
Filter detail67 mm front thread and rear filter holder; Canon specifies a single rear filter no thicker than 0.2 mm and recommends removing the holder when unused to avoid possible ghosting–
Weather resistanceDust and moisture resistant construction with mount rubber sealNo dust or moisture resistance
Dimensions detailApproximately 76.5 mm maximum diameter × 99.3 mm lengthApproximately 69 mm maximum diameter × 44.9 mm length, retracted
Weight detailApproximately 519 g lensApproximately 150 g lens
Lens hoodEW-73H hood includedEW-53B hood and LP814 pouch, sold separately
In the boxLens, E-67 II front cap, RF dust cap, EW-73H hood, LP1219 case, rear filter holder and user manualLens, E-49 front cap, RF lens dust cap and user manual
Release detailApril 2025 marketed month in Canon Camera MuseumNovember 2023 marketed month in Canon Camera Museum; Japan announcement specified early December 2023 regional availability

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