Canon RF 75–300mm F4–5.6 vs Canon RF 800mm F5.6L IS USM

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RF 75–300mm F4–5.6 compared with RF 800mm F5.6L IS USM

	CanonRF 75–300mm F4–5.6	CanonRF 800mm F5.6L IS USM
Overview
Released
Released	May 2025	May 2022
Optics
Lens type
Lens type	Zoom	Prime
Focal length
Focal length	75–300 mm	800 mm
Maximum aperture
Maximum aperture	f/4–5.6	f/5.6
Minimum aperture
Minimum aperture	f/32–45	f/64
Optical construction
Optical construction	Thirteen elements in nine groups; Canon states the optical design is adapted from the EF 75–300mm F4–5.6 III	Twenty-six elements in eighteen groups
Special elements
Special elements	–	Two fluorite elements, one Super UD and one UD element
Coatings
Coatings	Super Spectra; no fluorine coating	Super Spectra and ASC; fluorine coating on the front element
Aperture detail
Aperture detail	Maximum f/4 at 75 mm and f/5.6 at 300 mm; minimum f/32 and f/45 respectively	Maximum f/5.6; minimum f/64
Diaphragm
Diaphragm	Seven blades	Nine circular blades
Angle of view
Angle of view	Full-frame diagonal 32°11′–8°15′; horizontal 27°–6°50′; vertical 18°11′–4°35′	Full-frame diagonal 3°05′; horizontal 2°35′; vertical 1°40′
Mount and compatibility
Mounts
Mounts	Canon RF	Canon RF
Image circle
Image circle	Full frame	Full frame
Compatibility
Compatibility	Canon RF mount for full-frame and APS-C EOS R cameras; 120–480 mm equivalent field of view on Canon APS-C	Canon RF mount for full-frame and APS-C EOS R cameras
Teleconverter support
Teleconverter support	Not compatible with RF extenders (The-Digital-Picture)	RF 1.4× gives 1120 mm f/8 with 0.49× magnification; RF 2× gives 1600 mm f/11 with 0.71×; AF and IS operate with either extender
Focus and stabilisation
Autofocus
Autofocus	Yes	Yes
Minimum focus distance
Minimum focus distance	1.5 m	2.6 m
Maximum magnification
Maximum magnification	0.25×	0.34×
Optical stabilisation
Optical stabilisation	No	Yes
Autofocus detail
Autofocus detail	DC motor autofocus; no full-time manual focus override (Digital Camera World)	Ring-type USM; electronic full-time manual focus requires compatible body settings; original EOS R, RP and Ra are unsupported, and R5/R6 require firmware 1.3.0 or later
Focus distance detail
Focus distance detail	1.5 m minimum focus; front element and focus ring rotate during focusing (Digital Camera World and The-Digital-Picture)	2.6 m minimum focus; full range, 2.6–20 m and 20 m–infinity limiter settings; three manual-focus speeds and two stored focus presets
Magnification detail
Magnification detail	0.06× at 75 mm and 0.25× at 300 mm	0.34× maximum magnification; approximately 206 × 138 mm subject fills a full-frame image at minimum focus
Stabilisation detail
Stabilisation detail	No lens optical stabilisation	Canon UK and Japan rate optical IS at 4.5 stops with EOS R, R5 or R3 under CIPA yaw/pitch conditions; modes 1, 2 and 3
Video features
Video features	Substantial focus breathing in The-Digital-Picture's test	Aperture control in 1/8-stop increments; power-focus mode with two speeds selected by playback-ring rotation
Design
Dust and moisture resistant
Dust and moisture resistant	–	Yes
Filter diameter
Filter diameter	58 mm	52 mm
Maximum diameter
Maximum diameter	71.2 mm	163 mm
Length
Length	146.1 mm	432 mm
Weight
Weight	507 g (better)	3,140 g
Controls
Controls	Manual focus and zoom rings, AF/MF switch; no custom control ring (The-Digital-Picture)	Focus and playback rings, AF/PF/MF selector, focus-speed and preset switches, and four lens-function buttons
Zoom design
Zoom design	Extending zoom barrel; further extension and front rotation during focusing (Digital Camera World)	–
Filter detail
Filter detail	58 mm front thread rotates during focusing	52 mm drop-in screw-type holder 52 (WIII), supplied with a clear Protect filter; compatible with optional drop-in polariser and gelatin holder
Weather resistance
Weather resistance	Canon UK's table lists dust/moisture resistance, but Digital Camera World and The-Digital-Picture both report no weather sealing	Dust- and moisture-resistant construction with heat-reflective paint
Dimensions detail
Dimensions detail	71.2 mm maximum diameter × 146.1 mm retracted length	163 mm maximum diameter × 432 mm length
Weight detail
Weight detail	Approximately 507 g lens	Approximately 3,140 g lens
Tripod mount
Tripod mount	–	Supplied tripod collar and support foot
Lens hood
Lens hood	Optional ET-60 hood, not included	ET-155 (WIII) included; shorter ET-155B optional
In the box
In the box	Lens, E-58 II lens cap, RF dust cap and user manual	Lens, drop-in screw-type filter holder 52 (WIII) with 52 mm Protect filter, E-180E cap, RF dust cap, ET-155 (WIII) hood, LS600 soft case, Lens Wide Strap B and user manual
Release detail
Release detail	May 2025 release confirmed retrospectively by Canon's February 2026 press release and Canon Camera Museum	First sale in Japan on 26 May 2022, stated by Canon Japan support; the original announcement promised late May