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Canon RF 20-50mm F4L IS USM PZ vs Canon RF 85mm F1.2 L USM DS

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 85mm F1.2 L USM DS
Overview
ReleasedJune 2026December 2019
Optics
Lens typeZoomPrime
Focal length20–50 mm85 mm
Maximum aperturef/4f/1.2
Minimum aperturef/22f/16
Optical construction13 elements in 11 groupsThirteen elements in nine groups. Defocus Smoothing coating on two lens surfaces gradually lowers transmission towards their edges, softening out-of-focus highlight outlines without softening the focused subject; Digital Camera World reports about 1⅓ stops less light transmission at f/1.2 and a T2.2 transmission rating
Special elementsTwo glass-moulded aspherical and three UD elementsBR optical elements in one location, one UD element and one ground aspherical element; ASC and fluorine coatings
CoatingsASC and Super Spectra; fluorine coating on the front element–
Aperture detailConstant maximum f/4, minimum f/22 throughout the range–
DiaphragmNine aperture bladesNine blades with circular aperture
Angle of viewHorizontal 84°–40°, vertical 62°–27° and diagonal 94°–46° on full frame–
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 compatible–
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.24 m0.85 m
Maximum magnification0.33×0.12×
Optical stabilisationYesNo
Autofocus detailNano USM autofocus; full-time manual focus; maker rear-focus design retains length during focusingRing-type USM autofocus; full-time manual override (Digital Camera World)
Focus distance detail–Minimum focus 0.85 m; internal focusing and focus limiter (Digital Camera World)
Magnification detailMaker maximum magnification 0.14× at 20 mm or 0.33× at 50 mm; no AF/MF mode specified in the tableMaximum 0.12×
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 setupNo optical stabiliser
Video featuresInternal multi-speed power zoom and optically suppressed focus breathing; zoom ring switches between powered and conventional manual operation–
Design
Dust and moisture resistantYesYes
Filter diameter67 mm82 mm
Maximum diameter79.9 mm103.2 mm
Length98.4 mm117.3 mm
Weight420 g1,195 g
ControlsCustomisable control ring, focus ring and zoom ring; PZ/MZ selector, custom button, AF/MF and stabiliser switches (Digital Camera World; ePHOTOzine)Electronic manual-focus and customisable lens control rings; AF/MF and focus limiter switches
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 thread82 mm front filter thread
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 inferredWeather-sealed construction with front and rear fluorine coatings
Dimensions detailApproximately 79.9 mm maximum diameter × 98.4 mm lengthApproximately 103.2 mm maximum diameter × 117.3 mm length
Weight detailApproximately 420 g lensApproximately 1195 g lens
Lens hoodES-73B; maker lists E-67 II cap, Lens Dust Cap RF and LP1219 pouch as accessoriesET-89 hood included
In the box–Lens, E-82 II front cap, RF dust cap, ET-89 hood, LP1424 soft pouch and user manual
Release detailCanon Japan's 11 June 2026 notice confirms first sale from 26 June 2026, resolving the earlier late-June launch wordingDecember 2019 marketed month in Canon Camera Museum

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