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Canon RF 24–105mm F4L IS USM 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 24–105mm F4L IS USMCanonRF 45mm F1.2 STM
Overview
ReleasedOctober 2018November 2025
Optics
Lens typeZoomPrime
Focal length24–105 mm45 mm
Maximum aperturef/4f/1.2
Minimum aperturef/22f/16
Optical construction18 elements in 14 groupsNine elements in seven groups
Special elementsThree glass-moulded aspherical elements and one UD elementOne plastic-moulded aspherical element (Canon USA)
CoatingsASC and Super Spectra anti-reflection coatings; fluorine coatings on front and rearmost surfacesSuper Spectra coating
Aperture detail–f/1.2–16
DiaphragmNine blades with circular apertureNine aperture blades
Angle of viewFull-frame horizontal 74°–19°20′, vertical 53°–13° and diagonal 84°–23°20′43°35′ horizontal, 29°50′ vertical and 51°20′ diagonal on full frame
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityCanon EOS R cameras; full-frame image circle. RF optical model distinct from EF24–105mmF4L generations and RF24–105mmF4–7.1STMCanon EOS R cameras; full-frame image circle
Teleconverter supportCanon RF extenders not compatible; UK maker also lists EF12 II/EF25 II extension tubes incompatibleCanon RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.45 m0.45 m
Maximum magnification0.24×0.13×
Optical stabilisationYesNo
Autofocus detailNano USM autofocus; electronic manual focusGear-type STM autofocus with magnetic focus-position detection; full-time electronic manual focus
Focus distance detailMaker minimum focus distance 0.45 m; published AF/MF distinction absent and omittedMinimum focusing distance 0.45 m; Canon does not separately specify AF/MF distances
Magnification detailMaker maximum magnification 0.24×; no unpublished AF/MF distinction inferred–
Stabilisation detailLens optical IS rated five stops, CIPA with EOS R at105mm in Canon Camera Museum; OpticalLimits obtained about3.5–4stops in its electronic-shutter test, a separate measured resultNo optical image stabilisation (Canon USA)
Video featuresNano USM supports smooth movie autofocus; maker describes combined lens optical and camera electronic video IS separately from lens-only rating–
Design
Dust and moisture resistantYesNo
Filter diameter77 mm67 mm
Maximum diameter83.5 mm78 mm
Length107.3 mm75 mm
Weight700 g346 g
ControlsZoom and focus rings, customisable lens control ring and zoom transport lock; OpticalLimits found no creeping during its testSeparate focus and clickable control rings; AF/MF switch; no iris ring or lens function button (Canon USA)
Zoom designExtending zoom barrel; maker physical dimensions measured retracted–
Filter detail77 mm front filter thread67 mm front screw-in filter thread
Weather resistanceDust and moisture resistant construction, requiring attachment to a camera; cannot completely prevent dust/water ingress and is not waterproofNo dust or weather resistant construction (Canon USA)
Dimensions detailApproximately83.5mm maximum diameter ×107.3mm length in retracted stateApproximately 78 mm maximum diameter × 75 mm length
Weight detailApproximately700g lensApproximately 346 g lens
Lens hoodEW-83NOptional ES-73B hood and LP1116 case; E-67 II front cap and Lens Dust Cap RF listed by Canon
In the boxUK maker store lists lens, E-77 II cap, Lens Dust Cap RF, EW-83N hood, LP1319 case and user manualFront and rear lens caps (Amateur Photographer); hood not included
Release detailCanon Japan FAQ gives first sale 25 October 2018, consistent with Camera Museum marketed month; no exact UK on-sale day inferred. Maker Japan offers a control-ring de-click service, so the launch DCW statement that it cannot be de-clicked is not treated as current service availability. Co-sold RF standard zooms are alternatives, not inferred successor linksCanon 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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