Specifications#
Equivalent focal length on different cameras#
Field of view and depth-of-field equivalence when this lens is used on bodies with different sensor sizes (natively or via an adapter).
| Camera format | At 45 mm | Equiv. aperture (DoF) |
|---|---|---|
| Full frame | 45 mm · 51° | f/1.2 |
| APS-C | 68 mm · 35° | f/1.8 |
| APS-C (Canon) | 72 mm · 33° | f/1.9 |
| Micro Four Thirds | 90 mm · 27° | f/2.4 |
Depth of field & background blur#
Computed on its native Full frame format (CoC 30 µm). “Blur @2 m” is the size of an out-of-focus point at infinity, as a percentage of frame width, with the subject at 2 m — a simple bokeh index. Full table: 50 mm f/1.2 on full frame.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 45 mm | f/1.2 | 3.4 cm | 13.9 cm | 88.8 cm | 3.65 m | 56.3 m | 2.4% |
| 45 mm | f/4 | 11.4 cm | 47.0 cm | 3.21 m | 18.1 m | 16.9 m | 0.7% |
| 45 mm | f/8 | 22.9 cm | 97.9 cm | 8.96 m | ∞ | 8.48 m | 0.4% |
Handheld & night-sky limits#
NPF assumes typical 20–24 MP sensors (≈6 µm pixels on full frame, ≈3.9 µm on APS-C, ≈3.3 µm on Micro Four Thirds).
| Body | Min. handheld shutter (longest focal) | 500 rule at 45 mm | NPF at 45 mm, f/1.2 |
|---|---|---|---|
| Full frame | 1/50 s | 11 s | 5 s |
| APS-C | 1/60 s | 7 s | 4 s |
| APS-C (Canon) | 1/80 s | 7 s | 3 s |
| Micro Four Thirds | 1/100 s | 6 s | 3 s |
Compatible cameras#
Bodies in our database with a native Canon RF mount.
- Canon EOS R6 Mark III 2025
- Canon EOS C50 2025
- Canon EOS R50 V 2025
- Canon EOS R5 Mark II 2024
- Canon EOS R1 2024
- Canon EOS R100 2023
- Canon EOS R50 2023
- Canon EOS R8 2023
- Canon EOS R10 2022
- Canon EOS R6 Mark II 2022
- Canon EOS R7 2022
- Canon EOS R3 2021
- Canon EOS R5 2020
- Canon EOS R6 2020
- Canon EOS RP 2019
- Canon EOS R 2018
- Canon EOS R5 C
- Canon EOS R6 V
- Canon EOS R8 Mark II
Adapt it to other systems#
Similar lenses#
- Canon RF 50mm F1.2 L USM f/1.2
- Canon RF 50mm F1.4 L VCM f/1.4
- Canon RF 50mm F1.8 STM f/1.8
- Canon RF 35mm F1.4 L VCM f/1.4
- Sigma 30mm f/1.4 DC DN f/1.4
Frequently asked questions#
Is the Canon RF 45mm F1.2 STM full frame?
Yes — it covers the full 36 × 24 mm frame.
What is the Canon RF 45mm F1.2 STM equivalent to on APS-C?
On a 1.5× APS-C body it frames like 68 mm, and like 72 mm on Canon APS-C.
What is the Canon RF 45mm F1.2 STM good for?
As a standard prime it suits street, documentary, everyday and low-light shooting.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources