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Canon RF 45mm F1.2 STM vs Canon RF 75–300mm F4–5.6

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

Better figure, where one is clearly better

CanonRF 45mm F1.2 STMCanonRF 75–300mm F4–5.6
Overview
ReleasedNovember 2025May 2025
Optics
Lens typePrimeZoom
Focal length45 mm75–300 mm
Maximum aperturef/1.2f/4–5.6
Minimum aperturef/16f/32–45
Optical constructionNine elements in seven groupsThirteen elements in nine groups; Canon states the optical design is adapted from the EF 75–300mm F4–5.6 III
Special elementsOne plastic-moulded aspherical element (Canon USA)–
CoatingsSuper Spectra coatingSuper Spectra; no fluorine coating
Aperture detailf/1.2–16Maximum f/4 at 75 mm and f/5.6 at 300 mm; minimum f/32 and f/45 respectively
DiaphragmNine aperture bladesSeven blades
Angle of view43°35′ horizontal, 29°50′ vertical and 51°20′ diagonal on full frameFull-frame diagonal 32°11′–8°15′; horizontal 27°–6°50′; vertical 18°11′–4°35′
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityCanon EOS R cameras; full-frame image circleCanon RF mount for full-frame and APS-C EOS R cameras; 120–480 mm equivalent field of view on Canon APS-C
Teleconverter supportCanon RF extenders not compatibleNot compatible with RF extenders (The-Digital-Picture)
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.45 m1.5 m
Maximum magnification0.13×0.25×
Optical stabilisationNoNo
Autofocus detailGear-type STM autofocus with magnetic focus-position detection; full-time electronic manual focusDC motor autofocus; no full-time manual focus override (Digital Camera World)
Focus distance detailMinimum focusing distance 0.45 m; Canon does not separately specify AF/MF distances1.5 m minimum focus; front element and focus ring rotate during focusing (Digital Camera World and The-Digital-Picture)
Magnification detail–0.06× at 75 mm and 0.25× at 300 mm
Stabilisation detailNo optical image stabilisation (Canon USA)No lens optical stabilisation
Video features–Substantial focus breathing in The-Digital-Picture's test
Design
Dust and moisture resistantNo–
Filter diameter67 mm58 mm
Maximum diameter78 mm71.2 mm
Length75 mm146.1 mm
Weight346 g507 g
ControlsSeparate focus and clickable control rings; AF/MF switch; no iris ring or lens function button (Canon USA)Manual focus and zoom rings, AF/MF switch; no custom control ring (The-Digital-Picture)
Zoom design–Extending zoom barrel; further extension and front rotation during focusing (Digital Camera World)
Filter detail67 mm front screw-in filter thread58 mm front thread rotates during focusing
Weather resistanceNo dust or weather resistant construction (Canon USA)Canon UK's table lists dust/moisture resistance, but Digital Camera World and The-Digital-Picture both report no weather sealing
Dimensions detailApproximately 78 mm maximum diameter × 75 mm length71.2 mm maximum diameter × 146.1 mm retracted length
Weight detailApproximately 346 g lensApproximately 507 g lens
Lens hoodOptional ES-73B hood and LP1116 case; E-67 II front cap and Lens Dust Cap RF listed by CanonOptional ET-60 hood, not included
In the boxFront and rear lens caps (Amateur Photographer); hood not includedLens, E-58 II lens cap, RF 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 inferredMay 2025 release confirmed retrospectively by Canon's February 2026 press release and Canon Camera Museum

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