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Canon RF 10–20mm F4 L IS STM vs Canon RF 7-14mm F2.8-3.5L FISHEYE STM

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

Better figure, where one is clearly better

CanonRF 10–20mm F4 L IS STMCanonRF 7-14mm F2.8-3.5L FISHEYE STM
Overview
ReleasedOctober 2023February 2026
Optics
Lens typeZoomZoom
Focal length10–20 mm7–14 mm
Maximum aperturef/4f/2.8–3.5
Minimum aperturef/22f/22–29
Optical constructionSixteen elements in twelve groups; designed for use with digital distortion correction16 elements in 11 groups
Special elementsOne Super UD, three UD and three glass-moulded aspherical elements; one element is both UD and asphericalFive UD and two replica aspherical elements
CoatingsASC, Super Spectra and SWC coatings; front fluorine coatingThree ASC coatings and Super Spectra; fluorine coating on the front element
Aperture detail–f/2.8–22 at 7 mm and f/3.5–29 at 14 mm; maker minimum-aperture figures use 1/3-stop display
DiaphragmNine aperture bladesNine aperture blades
Angle of view130°25′–94° diagonal, 121°55′–84° horizontal and 100°25′–62° verticalHorizontal 190°–149°45′, vertical 190°–99°50′ and diagonal 190°–180° on full frame
ProjectionRectilinearCircular 190° fisheye at 7 mm and frame-filling diagonal 180° fisheye at 14 mm on full frame; circular mode uses equidistant projection; neither is rectilinear
Mount and compatibility
MountsCanon RFCanon RF
Image circleFull frameFull frame
CompatibilityCanon RF mount for full-frame and APS-C EOS R camerasCanon EOS R full-frame or APS-C cameras; APS-C cannot show the complete circular image and uses approximately 8.7 mm for diagonal coverage (Digital Camera World)
Teleconverter supportNot compatible with Canon RF extendersCanon RF extenders not compatible
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.25 m0.15 m (autofocus)
Maximum magnification0.12×0.35× (autofocus)
Optical stabilisationYesNo
Autofocus detailSTM autofocus optimised for smooth, near-silent focusing in stills and videoLeadscrew-type STM focusing with position sensors; full-time manual focus; maker rear-focusing design maintains length during focus
Focus distance detailMinimum focus 0.25 mMaker specifies 0.15 m throughout the 7–14 mm range in autofocus
Magnification detailMaximum 0.12× at 20 mm and 0.06× at 10 mmMaximum 0.35× at 14 mm in autofocus, measured at the image centre; do not assume identical magnification across a fisheye image
Stabilisation detailUp to five stops optical stabilisation tested with EOS R at 20 mm, or six stops coordinated stabilisation with EOS R3 at 20 mm; CIPA yaw and pitch testing. Peripheral Coordinated Control IS also compensates for peripheral blurNo lens optical IS; maker separately lists compatible camera IBIS at seven stops at the centre/14 mm under CIPA-2024 conditions
Video features–Circular fisheye material can be converted to monoscopic 2D 180° VR with EOS VR Utility on supported cameras; not a stereoscopic dual-fisheye lens; conversion compatibility depends on body and recording format
Design
Dust and moisture resistantYesYes
Maximum diameter83.7 mm76.5 mm
Length112 mm109.4 mm
Weight570 g476 g
ControlsSeparate zoom, focus and customisable control rings; customisable AF stop/function buttonZoom, focus and customisable control rings; AF/MF switch, function button and zoom lock/limit control (Digital Camera World)
Zoom design–Internal zoom and focus retain the same physical lens length (Amateur Photographer; Digital Camera World)
Filter detailNo front filter thread; rear holder accepts 35 × 20 mm gelatine filtersNo front screw-in filter thread; rear Drop-in Filter A system; supplied clear filter and optional Drop-in Variable ND Filter A or Drop-in Circular Polarizing Filter A
Weather resistanceDust and moisture resistant construction with front fluorine coatingDust and moisture resistant with mount gasket; Canon states attachment to a camera is needed and protection does not prevent all dust or water ingress; no waterproof/IP claim
Dimensions detail83.7 mm maximum diameter × 112 mm lengthApproximately 76.5 mm maximum diameter × 109.4 mm length, excluding detachable hood
Weight detailApproximately 570 g lensApproximately 476 g lens
Lens hoodBuilt-in lens hoodDetachable EW-76; remove for circular fisheye shooting to avoid the hood entering the image (Amateur Photographer; Digital Camera World)
In the boxLens, RF dust cap, Lens Cap 10-20, LP1219 lens case and user manualDrop-in clear filter included
Release detailOctober 2023 marketed month in Canon Camera MuseumCanon Japan specifies first sale on 20 February 2026; US announcement expected availability by the end of February, rather than the same exact regional day

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