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Canon RF 28–70mm F2.8 IS STM 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 28–70mm F2.8 IS STMCanonRF 75–300mm F4–5.6
Overview
ReleasedSeptember 2024May 2025
Optics
Lens typeZoomZoom
Focal length28–70 mm75–300 mm
Maximum aperturef/2.8f/4–5.6
Minimum aperturef/22f/32–45
Optical construction15 elements in 12 groupsThirteen elements in nine groups; Canon states the optical design is adapted from the EF 75–300mm F4–5.6 III
Special elementsTwo UD elements and two GMo aspherical elements–
CoatingsSuper Spectra; no fluorine coating, per UK maker specificationSuper Spectra; no fluorine coating
Aperture detail–Maximum f/4 at 75 mm and f/5.6 at 300 mm; minimum f/32 and f/45 respectively
DiaphragmNine 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
CompatibilityFull-frame image circle, Canon RF mount; incompatible with EF DSLRs and EOS M bodies. Canon RF extenders 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 support–Not compatible with RF extenders (The-Digital-Picture)
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.24 m (manual focus)1.5 m
Maximum magnification0.24×0.25×
Optical stabilisationYesNo
Autofocus detailLead-screw STM with magnetic motor-speed sensor and feedback control, electronic manual focusDC motor autofocus; no full-time manual focus override (Digital Camera World)
Focus distance detailMinimum focus at 28 mm is 0.27 m in AF or 0.24 m in MF; main figure retains the closer MF mode1.5 m minimum focus; front element and focus ring rotate during focusing (Digital Camera World and The-Digital-Picture)
Magnification detailMaximum 0.24× at 70 mm in either AF or MF0.06× at 75 mm and 0.25× at 300 mm
Stabilisation detailLens optical IS rated 5.5 central stops at 70 mm with EOS R8, yaw/pitch under CIPA2024. Japan current feature page rates coordinated EOS R6 Mark II body/lens IS 7.5 central and 7.0 peripheral stops, yaw/pitch/roll; original press release gives the same coordinated rating with EOS R1No lens optical stabilisation
Video featuresSmooth STM movie focusing; compatible camera breathing correction is digital. Cameralabs observes uncorrected focus breathing, more visible at 28 mmSubstantial focus breathing in The-Digital-Picture's test
Design
Dust and moisture resistantYes–
Filter diameter67 mm58 mm
Maximum diameter76.5 mm71.2 mm
Length92.2 mm146.1 mm
Weight490 g507 g
ControlsShared focus/control ring with AF/control/MF selector; separate zoom ring and stabilisation switchManual focus and zoom rings, AF/MF switch; no custom control ring (The-Digital-Picture)
Zoom designRetractable barrel must be extended to 28 mm before shooting; length 92.2 mm stored, 112.4 mm at 28 mm and 138.9 mm at 70 mm, per Japan maker tableExtending zoom barrel; further extension and front rotation during focusing (Digital Camera World)
Filter detail–58 mm front thread rotates during focusing
Weather resistanceUK maker states dust/moisture resistance, including rubber mount seal; no waterproof rating publishedCanon UK's table lists dust/moisture resistance, but Digital Camera World and The-Digital-Picture both report no weather sealing
Dimensions detailMaximum diameter 76.5 mm; 92.2 mm length when retracted71.2 mm maximum diameter × 146.1 mm retracted length
Weight detailUK current specification and store state 490 g; Japan current table, Camera Museum and original press release state 495 g. Main value follows UK specification; no undocumented regional variant inferredApproximately 507 g lens
Lens hoodEW-73D, sold separatelyOptional ET-60 hood, not included
In the boxUK maker store lists lens, E-67 II front cap, rear dust cap and user manualLens, E-58 II lens cap, RF dust cap and user manual
Release detailSeptember 2024 marketed month in Canon Camera Museum; original maker release specifies 27 September in Japan. No exact worldwide first-sale day inferred; no successor link inferred across co-sold standard zoomsMay 2025 release confirmed retrospectively by Canon's February 2026 press release and Canon Camera Museum

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