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Canon RF 10–20mm F4 L IS STM vs Canon RF 85mm F1.4L VCM

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

Better figure, where one is clearly better

CanonRF 10–20mm F4 L IS STMCanonRF 85mm F1.4L VCM
Overview
ReleasedOctober 2023September 2025
Optics
Lens typeZoomPrime
Focal length10–20 mm85 mm
Maximum aperturef/4f/1.4
Minimum aperturef/22f/16
Optical constructionSixteen elements in twelve groups; designed for use with digital distortion correction14 elements in 10 groups
Special elementsOne Super UD, three UD and three glass-moulded aspherical elements; one element is both UD and asphericalOne UD and one glass-moulded aspherical element
CoatingsASC, Super Spectra and SWC coatings; front fluorine coatingASC and Super Spectra; fluorine coating on the front element
Aperture detail–f/1.4–16 with stepless iris ring; no click-stop option (Amateur Photographer)
DiaphragmNine aperture blades11 circular aperture blades
Angle of view130°25′–94° diagonal, 121°55′–84° horizontal and 100°25′–62° vertical24° horizontal, 16° vertical and 28°30′ diagonal on full frame
ProjectionRectilinear–
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityCanon RF mount for full-frame and APS-C EOS R camerasCanon EOS R cameras; full-frame image circle; stills iris-ring support is body/firmware dependent
Teleconverter supportNot compatible with Canon RF extendersCanon RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.25 m0.75 m
Maximum magnification0.12×0.12×
Optical stabilisationYesNo
Autofocus detailSTM autofocus optimised for smooth, near-silent focusing in stills and videoVoice Coil Motor autofocus; electronic manual focus; maker notes movement/noise in unpowered internal VCM components is normal
Focus distance detailMinimum focus 0.25 m–
Magnification detailMaximum 0.12× at 20 mm and 0.06× at 10 mm–
Stabilisation detailUp to five stops optical stabilisation tested with EOS R at 20 mm, or six stops coordinated stabilisation with EOS R3 at 20 mm; CIPA yaw and pitch testing. Peripheral Coordinated Control IS also compensates for peripheral blurNo lens optical IS; maker separately lists camera IBIS CIPA-2024 performance of eight stops at the centre and seven at the corners under its camera/test conditions
Video features–Optically suppressed focus breathing and stepless iris control; UK maker footnote excludes stills iris-ring operation on EOS R/RP/Ra/R3/R5/R6/R6 Mark II/R7/R8/R10/R50/R100/R5 C even with current firmware
Design
Dust and moisture resistantYesYes
Filter diameter–67 mm
Maximum diameter83.7 mm76.5 mm
Length112 mm99.3 mm
Weight570 g636 g
ControlsSeparate zoom, focus and customisable control rings; customisable AF stop/function buttonCustomisable control ring, focus ring, iris ring with Auto-position lock, function button and AF/MF switch (Amateur Photographer)
Filter detailNo front filter thread; rear holder accepts 35 × 20 mm gelatine filters67 mm front screw-in filter thread; compatible Canon 67 mm Protect and PL-C B circular polarising filters
Weather resistanceDust and moisture resistant construction with front fluorine coatingDust and moisture resistant with mount gasket; Canon states protection requires attachment to a camera and cannot prevent all dust or water ingress; no waterproof/IP rating inferred
Dimensions detail83.7 mm maximum diameter × 112 mm lengthApproximately 76.5 mm maximum diameter × 99.3 mm length
Weight detailApproximately 570 g lensApproximately 636 g lens
Lens hoodBuilt-in lens hoodET-73C; maker lists E-67 II cap, Lens Dust Cap RF and LP1219 pouch as accessories
In the boxLens, RF dust cap, Lens Cap 10-20, LP1219 lens case and user manual–
Release detailOctober 2023 marketed month in Canon Camera MuseumCanon Japan specifies first sale on 27 September 2025; no UK first-sale day inferred

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