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Canon EF 40 mm f/ 2.8 STM Lens

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Canon EF 40 mm f/ 2.8 STM  lens


Canon EF 40 mm f/ 2.8 STM  MTF Chart

Optical design

Canon EF 40 mm f/ 2.8 STM  optical design

Canon EF 40 mm f/ 2.8 STM  optical design

Format: 35mm SLR

Type: Prime lens

Focusing: Auto Focus (AF)

Lens mounts: Canon EF, EF-S, Canon EF, EF-S

First year of production: 2012

Optical design: 6 elements in 4 groups

User reviews (1)

Photos (8)

Tests (0)

Owners (15)

Views (8553)

Average price: $179


Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)

Additional information:
  • Max. magnification: 0,18
  • Super Spectra Coating
  • Internal Focusing
  • FTM mode
  • Electromagnetic diaphragm
  • Diameter: 68mm
  • No distance scale
  • Preorder price: $200

The Canon EF 40mm F/2.8 STM is a super compact prime standard lens for 35mm SLR cameras with new type motor for fast and quiet continuous focusing (requires compatible camera with a hybrid auto focus). It is first 'pancake' for Canon EF mount.

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Posted by: dv   Date of publication: 09.06.2012

Photos taken with this lens Canon EF 40 mm f/ 2.8 STM :

Philip IV of Spain
Autor: NerveNet
5 0 260

KIO Building
Autor: NerveNet
3 0 1058

Picasso Builfing
Autor: NerveNet
3 0 1178

Blondine + bag
Autor: NerveNet
3 0 1110

Mechanical quality4.176
Optical quality4.676
Pricing / Value5.006
Overall lens rating

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Owner reviews: Canon EF 40 mm f/ 2.8 STM

NerveNet 26.06.2017 00:13:48
Period of use: 4 years


Very sharp lens wide open, sharper than the old Canon EF 35mm f/2 (when using the same aperture).

Very compact, very light, very small.

Full time manual focus availlable all time (meanwhile it is powered).

Quiet focus motor.


No DOF scale, no distance scale.

Focus by whire.

Expensive lens hood.

No weather seal.

Slow STM focus motor.


This small lens is very sharp, I'm very happy using it on my full frame camera.

Previously I used a Canon EF 35mm f/2 lens, but this 40mm lens is more sharper, smaller and lighter.

One drawnback for me is the lack of a proper distance and DOF scale, from time to time I like to use a hiperfocal distance in order to shot without focusing, without a proper scale this is a mess.

Another thing I do not like about this lens is the focus by whire, if you focus manually there is a lag between your movement and the movement of the motor. In any case the focus is accurate and smooth.

If do not need a more wider aperture this lens is a bargain for full frame camera users.