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Canon EF 28mm f/1.8 USM vs Canon RF 28mm F2.8 STM

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

Better figure, where one is clearly better

CanonEF 28mm f/1.8 USMCanonRF 28mm F2.8 STM
Overview
ReleasedSeptember 1995July 2023
Optics
Lens typePrimePrime
Focal length28 mm28 mm
Maximum aperturef/1.8f/2.8
Minimum aperturef/22f/22
Optical constructionTen elements in nine groupsEight elements in six groups
Special elementsAspherical lens elementThree plastic-moulded aspherical elements; Super Spectra coating; no fluorine coating
DiaphragmSeven bladesSeven blades, circular aperture
Angle of view75° diagonal, 65° horizontal and 46° vertical–
Mount and compatibility
MountsCanon EFCanon RF
Image circleFull frameFull frame
CompatibilityCanon EF cameras with full-frame or APS-C sensorsCanon RF mount, full-frame image circle; RF extenders not compatible
Adaptor supportEF12 II extension tube gives 0.61–0.43× magnification; EF25 II gives 1.13–0.96×–
Focus and stabilisation
AutofocusYesYes
Minimum focus distance0.25 m0.23 m
Maximum magnification0.18×0.17×
Optical stabilisation–No
Autofocus detailUSM autofocus with mechanical full-time manual focusing. Canon's manual specifies turning the ring with the shutter half-pressed after One Shot AFSTM autofocus and electronic manual focusing
Focus distance detailPhysical length remains constant and the front element does not rotate according to PhotozoneMinimum focusing distance 0.23 m
Magnification detail–Maximum 0.17× reproduction
Stabilisation detail–No lens optical IS; compatible camera stabilisation is separate
Design
Dust and moisture resistant–No
Filter diameter58 mm55 mm
Maximum diameter73.6 mm69.2 mm
Length55.6 mm24.7 mm
Weight310 g120 g
ControlsAF/MF switch, focus ring, distance window, depth-of-field scale and infrared focus indexCombined focus/control ring with AF/Control/MF selector
Weather resistance–No dust or moisture resistance
Dimensions detailMaximum diameter × length in retracted state; dimensions and 310 g weight are lens-only. Front and rear caps add 21.5 mm according to Canon's manualApproximately 69.2 mm maximum diameter × 24.7 mm length, retracted
Weight detail–Approximately 120 g lens
Lens hoodOptional EW-63 II petal hood; reversible for storage according to Canon's manualEW-55, sold separately
In the box–Lens, E-55 front cap, RF lens dust cap and user manual
Release detailCanon Camera Museum records September 1995 marketing; no first-sale day is givenJuly 2023 marketed month in Canon Camera Museum

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