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Black Canon RF 45mm f/1.2 STM prime lens, compact barrel, matte finish

Canon

Canon RF 45mm f/1.2 STM camera lens

SKU CH-EBK4-E371C

A compact 45mm prime lens with an f/1.2 aperture for shallow depth of field and strong low-light performance on Canon mirrorless cameras

  • TypeZoom Lens
  • CompatibilityMirrorless Camera
  • Wide f/1.2 aperture for shallow depth of field and low-light speed
  • 45 mm focal length gives natural perspective on full-frame mirrorless
  • PMo aspheric element corrects aberrations for sharp results at f/1.2
  • STM motor provides quiet and smooth autofocus during stills and video
  • Compact design from short back focus and large RF mount keeps kit light

Purpose and audience

The Canon RF 45mm f/1.2 STM is a standard prime lens built for mirrorless cameras. Its wide f/1.2 aperture suits photographers and content creators who want shallow depth of field and strong low-light performance in a compact form.

What the design enables

A large-diameter mount with short back focus combines with digital distortion correction to keep the lens compact and affordable for an f/1.2 optic. One PMo aspheric element reduces aberrations, a first for Canon at this aperture, while the STM motor supports smooth, quiet focusing for both stills and video.

Build and daily use

The lens uses Canon’s RF mount, ensuring full electronic communication with compatible mirrorless bodies. Its compact profile makes it practical for everyday carry, portrait sessions and lifestyle work where a fast, lightweight prime is preferred over larger alternatives. Buyers needing zoom flexibility or a narrower maximum aperture should consider other options.

Highlights

  • Wide f/1.2 aperture for shallow depth of field and low-light speed
  • 45 mm focal length gives natural perspective on full-frame mirrorless
  • PMo aspheric element corrects aberrations for sharp results at f/1.2
  • STM motor provides quiet and smooth autofocus during stills and video
  • Compact design from short back focus and large RF mount keeps kit light

Specifications

TypeZoom Lens
CompatibilityMirrorless Camera
BrandCanon

Questions about this item

Will the STM focus motor need servicing after heavy use?

The STM stepping motor is built into the lens barrel and has no user-serviceable parts; Canon does not publish a replacement interval for it.

What optical limit appears first when shooting wide open at f/1.2 for long sessions?

Residual spherical aberration and field curvature are the primary limits at maximum aperture; stopping down reduces both.

How much heat does the lens generate during all-day video recording?

The passive metal barrel dissipates heat from the STM motor and aperture drive; no active cooling is present and surface temperature stays within normal operating range.

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