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Canon RF 400mm F2.8L IS USM vs Canon RF 600mm F4L IS USM

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

Better figure, where one is clearly better

CanonRF 400mm F2.8L IS USMCanonRF 600mm F4L IS USM
Overview
ReleasedJuly 2021July 2021
Optics
Lens typePrimePrime
Focal length400 mm600 mm
Maximum aperturef/2.8f/4
Minimum aperturef/32f/32
Optical constructionSeventeen elements in thirteen groupsSeventeen elements in thirteen groups
Special elementsTwo fluorite elements and one Super UD elementTwo fluorite elements and one Super UD element
CoatingsSuper Spectra and ASC; fluorine coatings on front and rear elementsSuper Spectra and ASC; fluorine coatings on front and rear elements
Aperture detailMaximum f/2.8; minimum f/32Maximum f/4; minimum f/32
DiaphragmNine bladesNine blades
Angle of viewFull-frame diagonal 6°10′Full-frame diagonal 4°10′
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityCanon RF mount for full-frame and APS-C EOS R camerasCanon RF mount for full-frame and APS-C EOS R cameras; 960 mm equivalent field of view on Canon APS-C
Teleconverter supportCompatible with RF 1.4× and RF 2× extendersCompatible with RF 1.4× and RF 2× extenders
Focus and stabilisation
AutofocusYesYes
Minimum focus distance2.5 m4.2 m
Maximum magnification0.17×0.15×
Optical stabilisationYesYes
Autofocus detailRing-type USM with Power Doubled Focus Drive on compatible cameras; full-time manual overrideRing-type USM with Power Doubled Focus Drive on compatible cameras; full-time manual override
Focus distance detail2.5 m minimum focus; two stored focus presets and variable-speed manual focusing4.2 m minimum focus; two stored focus presets and variable-speed manual focusing
Magnification detail0.17× maximum magnification0.15× maximum magnification
Stabilisation detailCanon rates optical IS at 5.5 stops with EOS R or EOS R5 under CIPA yaw/pitch conditions; modes 1, 2 and 3Canon rates optical IS at 5.5 stops with EOS R or EOS R5 under CIPA yaw/pitch conditions; modes 1, 2 and 3
Video featuresAperture control in 1/8-stop increments; power-focus mode for controlled focus transitionsAperture control in 1/8-stop increments; power-focus mode for controlled focus transitions
Design
Dust and moisture resistantYesYes
Filter diameter52 mm52 mm
Maximum diameter163 mm168 mm
Length367 mm472 mm
Weight2,890 g3,090 g
ControlsFocus ring, playback ring, focus-preset controls and customisable lens-function buttons; no custom control ring (Cameralabs)Focus ring, playback ring, focus-preset controls and lens-function buttons; no custom control ring (Cameralabs)
Filter detail52 mm drop-in screw-type filter holder 52 (WIII), supplied with a clear Protect filter; optional circular polariser and gelatin holder52 mm drop-in screw-type filter holder 52 (WIII), supplied with a clear Protect filter; optional circular polariser and gelatin holder
Weather resistanceDust- and moisture-resistant construction with heat-reflective white paintDust- and moisture-resistant construction with heat-reflective white paint
Dimensions detail163 mm maximum diameter × 367 mm length168 mm maximum diameter × 472 mm length
Weight detailApproximately 2,890 g lensApproximately 3,090 g lens
Tripod mountRotating built-in foot with 1/4-inch and 3/8-inch threads; no Arca-Swiss dovetail (Cameralabs)Rotating built-in foot with 1/4-inch and 3/8-inch threads; no Arca-Swiss dovetail (Cameralabs)
Lens hoodET-155 (WIII) included; shorter ET-155B optionalET-160 (WIII) included; shorter ET-160B optional
In the boxLens, RF dust cap, drop-in screw-type filter holder 52 (WIII) with 52 mm Protect filter, E-180E soft cap, ET-155 (WIII) hood, LS400 soft case, Lens Wide Strap B and user manualLens, RF dust cap, drop-in screw-type filter holder 52 (WIII) with 52 mm Protect filter, E-185C soft cap, ET-160 (WIII) hood, LS600 soft case, Lens Wide Strap B and user manual
Release detailJuly 2021 Japanese first release, confirmed retrospectively by Canon's March 2022 announcement and Camera MuseumJuly 2021 Japanese first release confirmed retrospectively by Canon's March 2022 announcement and Camera Museum

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