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Canon RF 45mm F1.2 STM vs Canon RF-S 18–45mm F4.5–6.3 IS STM

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

Better figure, where one is clearly better

CanonRF 45mm F1.2 STMCanonRF-S 18–45mm F4.5–6.3 IS STM
Overview
ReleasedNovember 2025June 2022
Optics
Lens typePrimeZoom
Focal length45 mm18–45 mm
Maximum aperturef/1.2f/4.5–6.3
Minimum aperturef/16f/22–32
Optical constructionNine elements in seven groupsSeven elements in seven groups
Special elementsOne plastic-moulded aspherical element (Canon USA)Two plastic-moulded aspherical elements; Super Spectra coating; no fluorine coating
CoatingsSuper Spectra coating–
Aperture detailf/1.2–16Minimum f/22 at 18 mm and f/32 at 45 mm, per UK and Japan specifications; Camera Museum table lists f/18 at 18 mm
DiaphragmNine aperture bladesSeven blades
Angle of view43°35′ horizontal, 29°50′ vertical and 51°20′ diagonal on full frame–
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameAPS-C
CompatibilityCanon EOS R cameras; full-frame image circleCanon RF mount with APS-C image circle; full-frame EOS R bodies crop to APS-C; RF extenders and EF extension tubes not compatible
Teleconverter supportCanon RF extenders not compatible–
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.45 m0.15 m (manual focus)
Maximum magnification0.13×0.26× (manual focus)
Optical stabilisationNoYes
Autofocus detailGear-type STM autofocus with magnetic focus-position detection; full-time electronic manual focusSTM autofocus and electronic manual focusing
Focus distance detailMinimum focusing distance 0.45 m; Canon does not separately specify AF/MF distancesAutofocus minimum 0.20 m at 18 mm, 0.30 m at 35 mm and 0.35 m at 45 mm; manual-focus minimum 0.15 m, 0.24 m and 0.25 m at those focal lengths
Magnification detail–Autofocus maximum 0.14× at 18 mm, 0.15× at 35 mm and 0.16× at 45 mm; manual-focus maximum 0.25×, 0.21× and 0.26× respectively
Stabilisation detailNo optical image stabilisation (Canon USA)Optical IS rated four stops with EOS R10 at 45 mm under CIPA, yaw/pitch; coordinated IS rated 6.5 stops with EOS R7 at 45 mm under CIPA, yaw/pitch
Design
Dust and moisture resistantNoNo
Filter diameter67 mm49 mm
Maximum diameter78 mm69 mm
Length75 mm44.3 mm
Weight346 g130 g
ControlsSeparate focus and clickable control rings; AF/MF switch; no iris ring or lens function button (Canon USA)Combined focus/control ring and zoom ring; AF/MF and IS controlled through camera settings
Zoom design–Retractable barrel; lens must be extended for shooting
Filter detail67 mm front screw-in filter thread–
Weather resistanceNo dust or weather resistant construction (Canon USA)No dust or moisture resistance
Dimensions detailApproximately 78 mm maximum diameter × 75 mm lengthApproximately 69 mm maximum diameter × 44.3 mm length, retracted
Weight detailApproximately 346 g lensApproximately 130 g lens
Lens hoodOptional ES-73B hood and LP1116 case; E-67 II front cap and Lens Dust Cap RF listed by CanonEW-53 hood and LP814 pouch, sold separately
In the boxFront and rear lens caps (Amateur Photographer); hood not includedLens, E-49 front cap, RF lens dust cap and user manual
Release detailCanon 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 inferredJune 2022 marketed month in Canon Camera Museum

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