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Canon EF 40mm f/2.8 STM Pancake Lens
Canon EF 40mm f/2.8 STM Pancake Lens

Canon EF 40mm f/2.8 STM Pancake Lens

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The slimmest EF lens with merely 22.8mm thickness and weights only 130g to give superb mobility
Newly developed 6 elements in 4 groups optical lens construction
1 high-precision Glass-Molded (GMo) Aspherical lens element to achieve high image quality from the image center to periphery
Quiet and smooth continuous AF is supported in movie shooting and Live View shooting*1 by a thorough optimization of the continuous AF mechanism with the adoption of newly developed Stepping Motor (STM)
7-blade circular aperture for beautiful bokeh
New micro-stepping drive is used in the aperture control for quieter drive during movie shooting
0.30m minimum focusing distance with 0.18x maximum magnification
Lens placement and coatings are optimized for digital cameras to ensure excellent color balance and minimize ghosting and flare

Canon EF 40mm f/2.8 STM Lens
Lens Cap E-52
Lens Dust Cap E
Instruction Manual

Angle of View (diagonal) 57°30’

Lens Construction

6 elements in 4 groups

Special Lens Elements

1 Aspherical lens element

No. of Diaphragm Blades

7 (circular aperture)

Minimum Aperture


Closest Focusing Distance (m)


Maximum Magnification (x)


AF Actuator

Stepping Motor (STM)

Full-time Manual Focus


Image Stabilizer

Not Supported

Dust & Water Resistant*

Not Supported

Filter Diameter (mm)


Length x Diameter (mm)

22.8 x 68.2 mm

Weight (g)

Approx. 130g

Release Date

June 2012