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Canon RF 20-50mm F4L IS USM PZ 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 20-50mm F4L IS USM PZCanonRF 800mm F5.6L IS USM
Overview
ReleasedJune 2026May 2022
Optics
Lens typeZoomPrime
Focal length20–50 mm800 mm
Maximum aperturef/4f/5.6
Minimum aperturef/22f/64
Optical construction13 elements in 11 groupsTwenty-six elements in eighteen groups
Special elementsTwo glass-moulded aspherical and three UD elementsTwo fluorite elements, one Super UD and one UD element
CoatingsASC and Super Spectra; fluorine coating on the front elementSuper Spectra and ASC; fluorine coating on the front element
Aperture detailConstant maximum f/4, minimum f/22 throughout the rangeMaximum f/5.6; minimum f/64
DiaphragmNine aperture bladesNine circular blades
Angle of viewHorizontal 84°–40°, vertical 62°–27° and diagonal 94°–46° 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 circle; power-zoom control from camera body or remote devices depends on compatible model and firmwareCanon 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 distance0.24 m2.6 m
Maximum magnification0.33×0.34×
Optical stabilisationYesYes
Autofocus detailNano USM autofocus; full-time manual focus; maker rear-focus design retains length during focusingRing-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 detail–2.6 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 detailMaker maximum magnification 0.14× at 20 mm or 0.33× at 50 mm; no AF/MF mode specified in the table0.34× maximum magnification; approximately 206 × 138 mm subject fills a full-frame image at minimum focus
Stabilisation detailMaker six-stop optical IS or combined camera/lens eight stops at centre and corners under CIPA-2024, at maximum focal length with its specified camera; not guaranteed in every shooting setupCanon 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 featuresInternal multi-speed power zoom and optically suppressed focus breathing; zoom ring switches between powered and conventional manual operationAperture control in 1/8-stop increments; power-focus mode with two speeds selected by playback-ring rotation
Design
Dust and moisture resistantYesYes
Filter diameter67 mm52 mm
Maximum diameter79.9 mm163 mm
Length98.4 mm432 mm
Weight420 g3,140 g
ControlsCustomisable control ring, focus ring and zoom ring; PZ/MZ selector, custom button, AF/MF and stabiliser switches (Digital Camera World; ePHOTOzine)Focus and playback rings, AF/PF/MF selector, focus-speed and preset switches, and four lens-function buttons
Zoom designInternal zoom/focus keeps barrel length fixed; ePHOTOzine describes conventional mechanical manual zoom, while Digital Camera World's prose calls it fly-by-wire; no silent choice between those reviewer descriptions–
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 resistanceDust and moisture resistant with mount gasket; maker warns camera attachment is required and protection cannot prevent all dust or water ingress; no waterproof/IP rating inferredDust- and moisture-resistant construction with heat-reflective paint
Dimensions detailApproximately 79.9 mm maximum diameter × 98.4 mm length163 mm maximum diameter × 432 mm length
Weight detailApproximately 420 g lensApproximately 3,140 g lens
Tripod mount–Supplied tripod collar and support foot
Lens hoodES-73B; maker lists E-67 II cap, Lens Dust Cap RF and LP1219 pouch as accessoriesET-155 (WIII) included; shorter ET-155B optional
In the box–Lens, 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 11 June 2026 notice confirms first sale from 26 June 2026, resolving the earlier late-June launch wordingFirst sale in Japan on 26 May 2022, stated by Canon Japan support; the original announcement promised late May

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