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Canon RF 100–300mm F2.8L IS USM vs Canon RF 75–300mm F4–5.6

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 75–300mm F4–5.6
Overview
ReleasedMay 2023May 2025
Optics
Lens typeZoomZoom
Focal length100–300 mm75–300 mm
Maximum aperturef/2.8f/4–5.6
Minimum aperturef/22f/32–45
Optical constructionTwenty-three elements in eighteen groupsThirteen elements in nine groups; Canon states the optical design is adapted from the EF 75–300mm F4–5.6 III
Special elementsOne fluorite, four UD and one glass-moulded aspherical element–
CoatingsSuper Spectra, ASC and fluorine coatingsSuper Spectra; no fluorine coating
Aperture detailConstant maximum f/2.8; minimum f/22Maximum f/4 at 75 mm and f/5.6 at 300 mm; minimum f/32 and f/45 respectively
DiaphragmNine bladesSeven blades
Angle of viewFull-frame diagonal 24°–8°15′; horizontal 20°–6°50′; vertical 14°–4°35′Full-frame diagonal 32°11′–8°15′; horizontal 27°–6°50′; vertical 18°11′–4°35′
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; 120–480 mm equivalent field of view on Canon APS-C
Teleconverter supportRF 1.4× gives 140–420 mm f/4; RF 2× gives 200–600 mm f/5.6Not compatible with RF extenders (The-Digital-Picture)
Focus and stabilisation
AutofocusYesYes
Minimum focus distance1.8 m1.5 m
Maximum magnification0.16×0.25×
Optical stabilisationYesNo
Autofocus detailTwo Nano USM motors independently drive the electronic floating-focus groups; full-time electronic manual focusDC motor autofocus; no full-time manual focus override (Digital Camera World)
Focus distance detail1.8 m minimum focus throughout the zoom range; limiter selects full range or 6 m–infinity1.5 m minimum focus; front element and focus ring rotate during focusing (Digital Camera World and The-Digital-Picture)
Magnification detail0.06× at 100 mm and 0.16× at 300 mm0.06× at 75 mm and 0.25× at 300 mm
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 bodiesNo lens optical stabilisation
Video features–Substantial focus breathing in The-Digital-Picture's test
Design
Dust and moisture resistantYes–
Filter diameter112 mm58 mm
Maximum diameter128 mm71.2 mm
Length323.4 mm146.1 mm
Weight2,590 g507 g
ControlsSeparate focus, zoom and clicking control rings; front lens-function buttons and focus-preset controlsManual focus and zoom rings, AF/MF switch; no custom control ring (The-Digital-Picture)
Zoom designInternal zoom maintains barrel lengthExtending zoom barrel; further extension and front rotation during focusing (Digital Camera World)
Filter detail112 mm front screw-in thread; no rear drop-in filter58 mm front thread rotates during focusing
Weather resistanceDust- and moisture-resistant construction with heat-blocking white paintCanon UK's table lists dust/moisture resistance, but Digital Camera World and The-Digital-Picture both report no weather sealing
Dimensions detail128 mm maximum diameter × 323.4 mm length71.2 mm maximum diameter × 146.1 mm retracted length
Weight detailApproximately 2,590 g, as listed by Canon UK, Canon Japan and Canon Camera MuseumApproximately 507 g lens
Tripod mountRotating tripod collar with support foot–
Lens hoodET-124 includedOptional ET-60 hood, not included
In the boxLens, E-112 front cap, RF dust cap, ET-124 hood, LS100-300 soft case and user manualLens, E-58 II lens cap, RF dust cap and user manual
Release detailMay 2023 first release confirmed by Canon's June 2023 retrospective announcement and Camera MuseumMay 2025 release confirmed retrospectively by Canon's February 2026 press release and Canon Camera Museum

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