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Canon RF 28–70mm F2.8 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 28–70mm F2.8 IS STMCanonRF 45mm F1.2 STM
Overview
ReleasedSeptember 2024November 2025
Optics
Lens typeZoomPrime
Focal length28–70 mm45 mm
Maximum aperturef/2.8f/1.2
Minimum aperturef/22f/16
Optical construction15 elements in 12 groupsNine elements in seven groups
Special elementsTwo UD elements and two GMo aspherical elementsOne plastic-moulded aspherical element (Canon USA)
CoatingsSuper Spectra; no fluorine coating, per UK maker specificationSuper Spectra coating
Aperture detail–f/1.2–16
DiaphragmNine bladesNine aperture blades
Angle of view–43°35′ horizontal, 29°50′ vertical and 51°20′ diagonal on full frame
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityFull-frame image circle, Canon RF mount; incompatible with EF DSLRs and EOS M bodies. Canon RF extenders not compatibleCanon EOS R cameras; full-frame image circle
Teleconverter support–Canon RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.24 m (manual focus)0.45 m
Maximum magnification0.24×0.13×
Optical stabilisationYesNo
Autofocus detailLead-screw STM with magnetic motor-speed sensor and feedback control, electronic manual focusGear-type STM autofocus with magnetic focus-position detection; full-time electronic manual focus
Focus distance detailMinimum focus at 28 mm is 0.27 m in AF or 0.24 m in MF; main figure retains the closer MF modeMinimum focusing distance 0.45 m; Canon does not separately specify AF/MF distances
Magnification detailMaximum 0.24× at 70 mm in either AF or MF–
Stabilisation detailLens optical IS rated 5.5 central stops at 70 mm with EOS R8, yaw/pitch under CIPA2024. Japan current feature page rates coordinated EOS R6 Mark II body/lens IS 7.5 central and 7.0 peripheral stops, yaw/pitch/roll; original press release gives the same coordinated rating with EOS R1No optical image stabilisation (Canon USA)
Video featuresSmooth STM movie focusing; compatible camera breathing correction is digital. Cameralabs observes uncorrected focus breathing, more visible at 28 mm–
Design
Dust and moisture resistantYesNo
Filter diameter67 mm67 mm
Maximum diameter76.5 mm78 mm
Length92.2 mm75 mm
Weight490 g346 g
ControlsShared focus/control ring with AF/control/MF selector; separate zoom ring and stabilisation switchSeparate focus and clickable control rings; AF/MF switch; no iris ring or lens function button (Canon USA)
Filter detail–67 mm front screw-in filter thread
Zoom designRetractable barrel must be extended to 28 mm before shooting; length 92.2 mm stored, 112.4 mm at 28 mm and 138.9 mm at 70 mm, per Japan maker table–
Weather resistanceUK maker states dust/moisture resistance, including rubber mount seal; no waterproof rating publishedNo dust or weather resistant construction (Canon USA)
Dimensions detailMaximum diameter 76.5 mm; 92.2 mm length when retractedApproximately 78 mm maximum diameter × 75 mm length
Weight detailUK current specification and store state 490 g; Japan current table, Camera Museum and original press release state 495 g. Main value follows UK specification; no undocumented regional variant inferredApproximately 346 g lens
Lens hoodEW-73D, sold separatelyOptional 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-67 II front cap, rear dust cap and user manualFront and rear lens caps (Amateur Photographer); hood not included
Release detailSeptember 2024 marketed month in Canon Camera Museum; original maker release specifies 27 September in Japan. No exact worldwide first-sale day inferred; no successor link inferred across co-sold standard zoomsCanon 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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