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Canon RF 100mm F2.8 L Macro 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 100mm F2.8 L Macro IS USMCanonRF 45mm F1.2 STM
Overview
ReleasedJuly 2021November 2025
Optics
Lens typePrimePrime
Focal length100 mm45 mm
Maximum aperturef/2.8f/1.2
Minimum aperturef/32f/16
Macro lensYes–
Optical constructionSeventeen elements in thirteen groupsNine elements in seven groups
Special elements–One plastic-moulded aspherical element (Canon USA)
CoatingsSuper Spectra coating and front-element fluorine coatingSuper Spectra coating
Aperture detailMaximum f/2.8 at infinity; effective f-number becomes f/6.6 at 1.4× magnification according to the manualf/1.2–16
DiaphragmNine aperture 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
CompatibilityCanon RF mount for full-frame and APS-C EOS R cameras; EF12 II and EF25 II extension tubes not compatibleCanon EOS R cameras; full-frame image circle
Teleconverter supportCanon extenders not compatibleCanon RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.26 m0.45 m
Maximum magnification1.4×0.13×
Optical stabilisationYesNo
Autofocus detailDual Nano USM; electronic manual focusing with full-time manual override in One Shot AF when enabled in camera settingsGear-type STM autofocus with magnetic focus-position detection; full-time electronic manual focus
Focus distance detailMinimum focus 0.26 m from the imaging plane; 8.6 cm working distance from the lens front; limiter settings full, 0.5 m to infinity or 0.26–0.5 mMinimum focusing distance 0.45 m; Canon does not separately specify AF/MF distances
Magnification detailMaximum 1.4×; approximately 25 × 17 mm field of view at minimum focus–
Stabilisation detailHybrid IS rated up to 5 stops with EOS R; 2 stops at 1.0× under Canon test standards; up to 8 stops coordinated with EOS R5 IBIS under CIPA yaw/pitch testingNo optical image stabilisation (Canon USA)
Design
Dust and moisture resistantYesNo
Filter diameter67 mm67 mm
Maximum diameter81.5 mm78 mm
Length148 mm75 mm
Weight685 g346 g
ControlsManual-focus and customisable lens control rings; AF/MF, stabiliser and focus limiter switches; Spherical Aberration control ring with central-position lock. SA adjustment changes bokeh, soft focus, angle of view and exposure; its effect disappears at 0.26 mSeparate 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
Weather resistanceDust and moisture resistant construction; front fluorine coatingNo dust or weather resistant construction (Canon USA)
Dimensions detailApproximately 81.5 mm maximum diameter × 148 mm lengthApproximately 78 mm maximum diameter × 75 mm length
Weight detailApproximately 685 g lens only, excluding caps and optional tripod mountApproximately 346 g lens
Tripod mountTripod mount ring E (B) with dedicated adapter sold separately–
Lens hoodET-73C hood includedOptional ES-73B hood and LP1116 case; E-67 II front cap and Lens Dust Cap RF listed by Canon
In the boxLens, E-67 II front cap, RF dust cap, ET-73C hood, LP1222 lens case and user manual kit (Canon UK store)Front and rear lens caps (Amateur Photographer); hood not included
Release detailJuly 2021 marketed month in Canon Camera MuseumCanon 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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