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Canon RF 100–300mm F2.8L IS USM vs Canon RF 400mm F2.8L IS USM

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

Better figure, where one is clearly better

CanonRF 100–300mm F2.8L IS USMCanonRF 400mm F2.8L IS USM
Overview
ReleasedMay 2023July 2021
Optics
Lens typeZoomPrime
Focal length100–300 mm400 mm
Maximum aperturef/2.8f/2.8
Minimum aperturef/22f/32
Optical constructionTwenty-three elements in eighteen groupsSeventeen elements in thirteen groups
Special elementsOne fluorite, four UD and one glass-moulded aspherical elementTwo fluorite elements and one Super UD element
CoatingsSuper Spectra, ASC and fluorine coatingsSuper Spectra and ASC; fluorine coatings on front and rear elements
Aperture detailConstant maximum f/2.8; minimum f/22Maximum f/2.8; minimum f/32
DiaphragmNine bladesNine blades
Angle of viewFull-frame diagonal 24°–8°15′; horizontal 20°–6°50′; vertical 14°–4°35′Full-frame diagonal 6°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
Teleconverter supportRF 1.4× gives 140–420 mm f/4; RF 2× gives 200–600 mm f/5.6Compatible with RF 1.4× and RF 2× extenders
Focus and stabilisation
AutofocusYesYes
Minimum focus distance1.8 m2.5 m
Maximum magnification0.16×0.17×
Optical stabilisationYesYes
Autofocus detailTwo Nano USM motors independently drive the electronic floating-focus groups; full-time electronic manual focusRing-type USM with Power Doubled Focus Drive on compatible cameras; full-time manual override
Focus distance detail1.8 m minimum focus throughout the zoom range; limiter selects full range or 6 m–infinity2.5 m minimum focus; two stored focus presets and variable-speed manual focusing
Magnification detail0.06× at 100 mm and 0.16× at 300 mm0.17× maximum magnification
Stabilisation detailCanon rates lens optical IS at 5.5 stops under CIPA conditions, and coordinated IS at up to 6 stops with EOS R5 and compatible bodiesCanon rates optical IS at 5.5 stops with EOS R or EOS R5 under CIPA yaw/pitch conditions; modes 1, 2 and 3
Video features–Aperture control in 1/8-stop increments; power-focus mode for controlled focus transitions
Design
Dust and moisture resistantYesYes
Filter diameter112 mm52 mm
Maximum diameter128 mm163 mm
Length323.4 mm367 mm
Weight2,590 g2,890 g
ControlsSeparate focus, zoom and clicking control rings; front lens-function buttons and focus-preset controlsFocus ring, playback ring, focus-preset controls and customisable lens-function buttons; no custom control ring (Cameralabs)
Zoom designInternal zoom maintains barrel length–
Filter detail112 mm front screw-in thread; no rear drop-in filter52 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-blocking white paintDust- and moisture-resistant construction with heat-reflective white paint
Dimensions detail128 mm maximum diameter × 323.4 mm length163 mm maximum diameter × 367 mm length
Weight detailApproximately 2,590 g, as listed by Canon UK, Canon Japan and Canon Camera MuseumApproximately 2,890 g lens
Tripod mountRotating tripod collar with support footRotating built-in foot with 1/4-inch and 3/8-inch threads; no Arca-Swiss dovetail (Cameralabs)
Lens hoodET-124 includedET-155 (WIII) included; shorter ET-155B optional
In the boxLens, E-112 front cap, RF dust cap, ET-124 hood, LS100-300 soft case and user manualLens, 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 manual
Release detailMay 2023 first release confirmed by Canon's June 2023 retrospective announcement and Camera MuseumJuly 2021 Japanese first release, confirmed retrospectively by Canon's March 2022 announcement and Camera Museum

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