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Canon RF 100mm F2.8 L Macro 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 100mm F2.8 L Macro IS USMCanonRF 75–300mm F4–5.6
Overview
ReleasedJuly 2021May 2025
Optics
Lens typePrimeZoom
Focal length100 mm75–300 mm
Maximum aperturef/2.8f/4–5.6
Minimum aperturef/32f/32–45
Macro lensYes–
Optical constructionSeventeen elements in thirteen groupsThirteen elements in nine groups; Canon states the optical design is adapted from the EF 75–300mm F4–5.6 III
CoatingsSuper Spectra coating and front-element fluorine coatingSuper Spectra; no fluorine coating
Aperture detailMaximum f/2.8 at infinity; effective f-number becomes f/6.6 at 1.4× magnification according to the manualMaximum f/4 at 75 mm and f/5.6 at 300 mm; minimum f/32 and f/45 respectively
DiaphragmNine aperture bladesSeven blades
Angle of view–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 cameras; EF12 II and EF25 II extension tubes not compatibleCanon RF mount for full-frame and APS-C EOS R cameras; 120–480 mm equivalent field of view on Canon APS-C
Teleconverter supportCanon extenders not compatibleNot compatible with RF extenders (The-Digital-Picture)
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.26 m1.5 m
Maximum magnification1.4×0.25×
Optical stabilisationYesNo
Autofocus detailDual Nano USM; electronic manual focusing with full-time manual override in One Shot AF when enabled in camera settingsDC motor autofocus; no full-time manual focus override (Digital Camera World)
Focus distance detailMinimum focus 0.26 m from the imaging plane; 8.6 cm working distance from the lens front; limiter settings full, 0.5 m to infinity or 0.26–0.5 m1.5 m minimum focus; front element and focus ring rotate during focusing (Digital Camera World and The-Digital-Picture)
Magnification detailMaximum 1.4×; approximately 25 × 17 mm field of view at minimum focus0.06× at 75 mm and 0.25× at 300 mm
Stabilisation detailHybrid IS rated up to 5 stops with EOS R; 2 stops at 1.0× under Canon test standards; up to 8 stops coordinated with EOS R5 IBIS under CIPA yaw/pitch testingNo lens optical stabilisation
Video features–Substantial focus breathing in The-Digital-Picture's test
Design
Dust and moisture resistantYes–
Filter diameter67 mm58 mm
Maximum diameter81.5 mm71.2 mm
Length148 mm146.1 mm
Weight685 g507 g
ControlsManual-focus and customisable lens control rings; AF/MF, stabiliser and focus limiter switches; Spherical Aberration control ring with central-position lock. SA adjustment changes bokeh, soft focus, angle of view and exposure; its effect disappears at 0.26 mManual focus and zoom rings, AF/MF switch; no custom control ring (The-Digital-Picture)
Zoom design–Extending zoom barrel; further extension and front rotation during focusing (Digital Camera World)
Filter detail–58 mm front thread rotates during focusing
Weather resistanceDust and moisture resistant construction; front fluorine coatingCanon UK's table lists dust/moisture resistance, but Digital Camera World and The-Digital-Picture both report no weather sealing
Dimensions detailApproximately 81.5 mm maximum diameter × 148 mm length71.2 mm maximum diameter × 146.1 mm retracted length
Weight detailApproximately 685 g lens only, excluding caps and optional tripod mountApproximately 507 g lens
Tripod mountTripod mount ring E (B) with dedicated adapter sold separately–
Lens hoodET-73C hood includedOptional ET-60 hood, not included
In the boxLens, E-67 II front cap, RF dust cap, ET-73C hood, LP1222 lens case and user manual kit (Canon UK store)Lens, E-58 II lens cap, RF dust cap and user manual
Release detailJuly 2021 marketed month in Canon Camera MuseumMay 2025 release confirmed retrospectively by Canon's February 2026 press release and Canon Camera Museum

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