Canon Canon RF Prime

RF 45mm F1.2 STM

45mm
f/1.2
Prime
346 g

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Quick answer

The Canon RF 45mm F1.2 STM is a standard prime lens covering 45mm at f/1.2 for the Canon RF mount. Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.

About this lens

This 45mm f/1.2 fast standard prime lens from Canon fits Canon RF mount cameras, with stepping-motor autofocus. The natural field of view suits street, documentary and everyday photography.

Canon RF 45mm F1.2 STM specifications

Brand: Canon
Mount: Canon RF
Focal length: 45mm
Maximum aperture: f/1.2
Lens type: Prime
Format coverage: full-frame
Released: 2025
Autofocus motor: STM
Filter thread: 67 mm
Weight: 346 g
Length: 75 mm
Diameter: 78 mm

Specification source: en.wikipedia.org

What can you shoot with the Canon RF 45mm F1.2 STM?

At 45mm this is a standard prime, which typically suits:

Everyday and street photography
Natural-perspective portraits
Documentary and travel work

Its very wide maximum aperture suits low light and shallow depth of field with strong background blur.

Full-frame equivalent and field of view

Calculated from the focal length and crop factor. Not measured.

Sensor	Crop	Equivalent	Horizontal FOV	Diagonal FOV
Full frame	1.0x	45mm	43.6°	51.4°
APS-C	1.6x	72mm	28.1°	33.4°

Try the field-of-view calculator

Frequently asked questions

What mount does the Canon RF 45mm F1.2 STM use?

It uses the Canon RF mount, so it fits Canon RF cameras directly.

What is the focal length of the Canon RF 45mm F1.2 STM?

It is a fixed 45mm lens with a maximum aperture of f/1.2. That makes it a standard lens.

Is the Canon RF 45mm F1.2 STM a prime or a zoom lens?

It is a prime lens with a fixed 45mm focal length. Primes usually open wider than zooms; this one opens to f/1.2.

What is the Canon RF 45mm F1.2 STM equivalent on a crop sensor?

On APS-C (1.6x crop) it frames like 72mm on full frame, with a 28.1° horizontal and 33.4° diagonal field of view. These figures are calculated from the focal length and crop factor.