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 40 mm | Equiv. aperture (DoF) |
|---|---|---|
| Full frame | 40 mm · 57° | f/2.8 |
| APS-C | 60 mm · 39° | f/4.2 |
| APS-C (Canon) | 64 mm · 37° | f/4.5 |
| Micro Four Thirds | 80 mm · 30° | f/5.6 |
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: 40 mm f/2.8 on full frame.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 40 mm | f/2.8 | 10.1 cm | 41.6 cm | 2.79 m | 14.4 m | 19.1 m | 0.8% |
| 40 mm | f/4 | 14.5 cm | 60.1 cm | 4.32 m | 33.8 m | 13.4 m | 0.6% |
| 40 mm | f/8 | 29.4 cm | 1.29 m | 16.7 m | ∞ | 6.71 m | 0.3% |
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 40 mm | NPF at 40 mm, f/2.8 |
|---|---|---|---|
| Full frame | 1/40 s | 12 s | 7 s |
| APS-C | 1/60 s | 8 s | 5 s |
| APS-C (Canon) | 1/60 s | 8 s | 5 s |
| Micro Four Thirds | 1/80 s | 6 s | 5 s |
Compatible cameras#
Bodies in our database with a native Canon EF mount.
- Canon EOS-1D X Mark III 2020
- Canon EOS 6D Mark II 2017
- Canon EOS 5D Mark IV 2016
- Canon EOS-1D X Mark II 2016
- Canon EOS 5DS 2015
- Canon EOS 5DS R 2015
- Blackmagic Design Pocket Cinema Camera 2013
- Canon EOS 5D Mark III 2012
- Canon EOS 6D 2012
- Canon EOS-1D X 2012
- Canon EOS-1D C 2012
- Canon EOS-1D Mark IV 2009
- Canon EOS 5D Mark II 2008
- Canon EOS-1Ds Mark III 2007
- Canon EOS-1D Mark III 2007
- Canon EOS 5D 2005
- Canon EOS-1Ds Mark II 2004
- Kodak DCS Pro SLR/c 2004
- Canon EOS-1D Mark II 2004
- Canon EOS 30V 2004
- Canon EOS-1Ds 2002
- Canon EOS 3000N 2002
- Canon EOS 300V 2002
- Canon EOS-1D 2001
- Canon EOS-1V 2000
- Canon EOS 30 2000
- Canon EOS D2000 1998
- Canon EOS-3 1998
- Canon EOS 500N 1996
- Canon EOS IX 1996
- Canon EOS 50 1995
- Canon EOS-1N 1994
- Canon EOS 500 1993
- Canon EOS 5 1992
- Canon EF-M camera 1991
- Canon EOS 100 1991
- Canon EOS 1000 1990
- Canon EOS-1 1989
- Canon EOS 650 1987
- Canon EOS C300
Adapt it to other systems#
Similar lenses#
- Sigma 40mm F1.4 DG HSM | Art f/1.4
- Canon TS-E 45mm f/2.8 f/2.8
- Tamron SP 45mm F/1.8 Di VC USD f/1.8
- Canon EF 35mm f/1.4L II USM f/1.4
- Canon EF 35mm f/1.4L USM f/1.4
- Canon EF 35mm f/2 f/2
- Canon EF 35mm f/2 IS USM f/2
- Sigma 35mm f/1.4 DG HSM | A f/1.4
- Tamron SP 35mm f/1.4 Di USD f/1.4
- Tamron SP 35mm f/1.8 Di VC USD F012 f/1.8
- Zeiss Carl Zeiss Distagon T* 2/35 ZF.2 f/2
- Viltrox AF 33mm f/1.4 XF f/1.4
Frequently asked questions#
Is the Canon EF 40mm f/2.8 STM full frame?
Yes — it covers the full 36 × 24 mm frame.
What is the Canon EF 40mm f/2.8 STM equivalent to on APS-C?
On a 1.5× APS-C body it frames like 60 mm, and like 64 mm on Canon APS-C.
What is the Canon EF 40mm f/2.8 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