Cameras Ranked

45 Canon RF 45mm F1.2 STM

The Canon RF 45mm F1.2 STM is a prime lens for Canon RF (Full frame) that covers 45 mm at f/1.2, weighs 346 g and focuses as close as 0.45 m. Widest view (45 mm) of the 4 full frame Canon RF prime lenses in its focal range. Among them, it suits you if you carry it all day or travel light, or you want a wider view at the short end.

  • f/1.2widest aperture
  • 346 gweight
  • 17bodies it fits
To one scale. Canon RF 45mm F1.2 STM: length 75 mm, diameter 78 mm, filter thread 67 mm.75 mmø78
To scale from the maker's length and diameter, the mount on the left and the filter thread in yellow at the front. The rings are drawn, not measured.

Compare it with another lensAll Canon RF lenses

To one scale. Canon RF 45mm F1.2 STM: length 75 mm, diameter 78 mm, filter thread 67 mm.75 mmø78
To scale from the maker's length and diameter, the mount on the left and the filter thread in yellow at the front. The rings are drawn, not measured.

Where it sits

4 lenses

Full frame Canon RF prime lenses in its focal range that state each value, this one included. Each tick is one; the thick one is this one.

Bodies it fits

17 bodies

All cameras, by maker and mount

Specifications

Focal length
45 mm1
Widest aperture
f/1.21
Closest focus
0.45 m2
Maximum magnification
0.13x2
Stabilization
No
Mount
Canon RF2
Covers
Full frame
Type
Prime
Weight
346 g2
Length
75 mm2
Diameter
78 mm2
Filter thread
67 mm2
Elements
92
Groups
72
Aperture blades
92
Weather sealed
No2
Focus motor
Gear-type STM2
Hood
ES-73B (sold separately)2

Sources

  1. Wikidata, checked Oct 9, 2026 (CC0 1.0)
  2. Canon product specifications, checked Oct 6, 2026

Worked out by code, not stated by a source

  • Read from the lens name: each maker marks the sensor size a lens covers (Sony FE/E, Canon RF/RF-S, Nikon DX, Tamron Di III/Di III-A, Sigma DG/DC); every Fujifilm X lens is APS-C and every Micro Four Thirds lens is Four Thirds.
  • Read from the lens name: Sony marks optically stabilized lenses OSS, Canon IS, Nikon VR, Fujifilm OIS, Panasonic O.I.S., Tamron VC and Sigma OS; a lens from these makers without the mark has no optical stabilization.
  • Prime or zoom, read from the focal length in the lens name.

Each value is checked automatically against the source it links, on the date shown. How we build these pages

† The makers' own tables, row by row, with labels in our plain words (translated where the maker's page isn't in English); each row's numbers are checked against the page it links.

Full specifications†

Show all 15 rows
Full specificationsCanon RF 45mm F1.2 STM2
Diagonal angle of view51°20 (Diagonal)
Horizontal angle of view43°35 (Horizontal)
Vertical angle of view29°50 (Vertical)
Closest focusing distance0.45 / 1.47
Lens construction7, 9 (Groups Elements)
Diameter and length78.0 × 75.0 (Approx.)
Drive system typeGear-type STM
Filter size67
Maximum magnification0.13x
Minimum aperture16
Number of diaphragm blades9
Weight346 (Approx.)
Included lens capE-67II & Lens Dust Cap RF (included)
Lens hood modelES-73B (sold separately)
Lens bag modelLP1116 (sold separately)

How the pick works

  1. Widest aperture3

    Lower wins once they are 0.3 apart.

  2. Weight2

    Lower wins from a 12% gap.

  3. Focal length (longest)2

    Higher wins from a 15% gap.

  4. Focal length (widest)2

    Lower wins once they are 2 mm apart.

  5. Optical stabilization1

    Having it wins.

  6. Closest focus, wide end1

    Lower wins from a 15% gap. Compared only between lenses of the same focal length (widest).

  7. Filter thread0.5

    Lower wins once they are 5 mm apart.

  8. Lead for a pick1

Our pick or our take adds up the importance of each real difference, with these importances and thresholds: a gap smaller than its row's threshold is too close to call and counts as the same. They are our editorial choice, not a measurement, the same on every page, and they never read prices, sales or who sells it.

Paid placements0

How we rank, in full