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Certified Keeper Canon EF 40mm f/2.8 STM
85 PixelMeter Score 22 reviews

Pros Pros
  • Extremely compact and lightweight pancake design
  • Excellent sharpness and optical clarity
  • Durable build quality featuring a metal mount
  • Affordable price point
  • Smooth and accurate autofocus motor
Cons Cons
  • Inconsistent or slow autofocus speed
  • Limited manual focus functionality
  • Audible autofocus noise during video recording
  • Noticeable vignetting at wide apertures
  • Lack of included lens hood

Launch price Launch price $199
Focal length & aperture Focal length & aperture 40mm f/2.8
Mount & coverage Mount & coverage Canon EF · Full-Frame
Stabilization Stabilization None
Close focus Close focus 30 cm (0.18x)
Filter thread Filter thread 52mm
Autofocus motor Autofocus motor STM
Weight & size Weight & size 130g (4.6 oz) · 68 x 22 mm (2.68 x 0.87 in)

Announcement date Announcement date June 1, 2012
Launch MSRP Launch MSRP $199
Lens mount Lens mount Canon EF
Image circle coverage Image circle coverage Full-Frame
Lens type Lens type Prime
Lens line / series Lens line / series EF

Elements Elements 6
Groups Groups 4
Special elements Special elements 1 aspherical
Coatings Coatings Super Spectra Coating
Front fluorine coating Front fluorine coating No

Focal length (wide) Focal length (wide) 40mm
Max aperture Max aperture f/2.8
Minimum aperture Minimum aperture f/22
Diaphragm blades Diaphragm blades 7

Diagonal angle of view Diagonal angle of view 57° - 30°

Autofocus motor Autofocus motor STM
Minimum focus distance Minimum focus distance 30 cm
Maximum magnification Maximum magnification 0.18x
Focus mechanism Focus mechanism Internal focus

Optical stabilization (OIS) Optical stabilization (OIS) No

Aperture ring Aperture ring No
AF/MF switch AF/MF switch No

Weight Weight 130g (4.6 oz)
Maximum diameter Maximum diameter 68mm (2.68 in)
Length Length 22mm (0.87 in)
Filter thread Filter thread 52mm
Weather sealing Weather sealing None
Internal zoom Internal zoom No
Tripod collar Tripod collar Not supported
Maximum extended length Maximum extended length 22.8mm

Lens hood Lens hood ES-52, optional
Teleconverter compatibility Teleconverter compatibility Not supported