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Canon RF 45mm F1.2 STM vs Canon RF 800mm F5.6L IS USM

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

Better figure, where one is clearly better

CanonRF 45mm F1.2 STMCanonRF 800mm F5.6L IS USM
Overview
ReleasedNovember 2025May 2022
Optics
Lens typePrimePrime
Focal length45 mm800 mm
Maximum aperturef/1.2f/5.6
Minimum aperturef/16f/64
Optical constructionNine elements in seven groupsTwenty-six elements in eighteen groups
Special elementsOne plastic-moulded aspherical element (Canon USA)Two fluorite elements, one Super UD and one UD element
CoatingsSuper Spectra coatingSuper Spectra and ASC; fluorine coating on the front element
Aperture detailf/1.2–16Maximum f/5.6; minimum f/64
DiaphragmNine aperture bladesNine circular blades
Angle of view43°35′ horizontal, 29°50′ vertical and 51°20′ diagonal on full frameFull-frame diagonal 3°05′; horizontal 2°35′; vertical 1°40′
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
Teleconverter supportCanon RF extenders not compatibleRF 1.4× gives 1120 mm f/8 with 0.49× magnification; RF 2× gives 1600 mm f/11 with 0.71×; AF and IS operate with either extender
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.45 m2.6 m
Maximum magnification0.13×0.34×
Optical stabilisationNoYes
Autofocus detailGear-type STM autofocus with magnetic focus-position detection; full-time electronic manual focusRing-type USM; electronic full-time manual focus requires compatible body settings; original EOS R, RP and Ra are unsupported, and R5/R6 require firmware 1.3.0 or later
Focus distance detailMinimum focusing distance 0.45 m; Canon does not separately specify AF/MF distances2.6 m minimum focus; full range, 2.6–20 m and 20 m–infinity limiter settings; three manual-focus speeds and two stored focus presets
Magnification detail–0.34× maximum magnification; approximately 206 × 138 mm subject fills a full-frame image at minimum focus
Stabilisation detailNo optical image stabilisation (Canon USA)Canon UK and Japan rate optical IS at 4.5 stops with EOS R, R5 or R3 under CIPA yaw/pitch conditions; modes 1, 2 and 3
Video features–Aperture control in 1/8-stop increments; power-focus mode with two speeds selected by playback-ring rotation
Design
Dust and moisture resistantNoYes
Filter diameter67 mm52 mm
Maximum diameter78 mm163 mm
Length75 mm432 mm
Weight346 g3,140 g
ControlsSeparate focus and clickable control rings; AF/MF switch; no iris ring or lens function button (Canon USA)Focus and playback rings, AF/PF/MF selector, focus-speed and preset switches, and four lens-function buttons
Filter detail67 mm front screw-in filter thread52 mm drop-in screw-type holder 52 (WIII), supplied with a clear Protect filter; compatible with optional drop-in polariser and gelatin holder
Weather resistanceNo dust or weather resistant construction (Canon USA)Dust- and moisture-resistant construction with heat-reflective paint
Dimensions detailApproximately 78 mm maximum diameter × 75 mm length163 mm maximum diameter × 432 mm length
Weight detailApproximately 346 g lensApproximately 3,140 g lens
Tripod mount–Supplied tripod collar and support foot
Lens hoodOptional ES-73B hood and LP1116 case; E-67 II front cap and Lens Dust Cap RF listed by CanonET-155 (WIII) included; shorter ET-155B optional
In the boxFront and rear lens caps (Amateur Photographer); hood not includedLens, drop-in screw-type filter holder 52 (WIII) with 52 mm Protect filter, E-180E cap, RF dust cap, ET-155 (WIII) hood, LS600 soft case, Lens Wide Strap B 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 inferredFirst sale in Japan on 26 May 2022, stated by Canon Japan support; the original announcement promised late May

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