Canon EF 40mm f/2.8 STM - Lens review and specs

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Canon EF Prime full-frame 2012

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40mm

Focal length

f/2.8

Max aperture

130 g

Weight

14mm35mm85mm200mm600mm

▲ 40mm

Max aperture

f/1.8

f/2.8

f/5.6

Constant Aperture

Aperturef/2.8

f/2.8f/22

Near focus6' 5"

Far focus8' 0"

Total DOF1' 6"

Hyperfocal65' 2"

Subject distance7' 1"

Focal length40 mm

Aperturef/2.8

SensorFull Frame

Illustrative scene preview based on this lens's focal length, aperture, and sensor coverage.

This preview uses 40mm, f/2.8, and Full Frame. Subject distance is estimated to keep lens previews comparable.

Min aperture: f/22
Diaphragm blades: 7

Optics

Optical construction: 6 elements in 4 groups
Special elements: 1 glass-molded aspherical element
Coatings: Super Spectra Coating

Focusing

Minimum focus: 30 cm
Max magnification: 0.18×
AF motor: STM

Physical

Weight: 130 g
Dimensions: ⌀68mm × 23mm
Filter thread: 52 mm
Color: Black

Recommended Use

Ideal for: Street, Travel, Walkaround / Daily

Release year: 2012
Announced: Jun 8, 2012
Approx price: $199 USD
Optical correction & RAW development: NDPix Photo Editor

The best

Extreme Portability without Optical Sacrifice: It is the thinnest Canon lens (just 22.8 mm), which transforms a heavy SLR camera into a discreet and lightweight device. Unlike other budget lenses, its "pancake" design maintains professional sharpness from f/2.8, even surpassing several L-series zooms at that focal length.

Also

STM Focus Optimized for Video: Its stepping motor (Stepping Motor) offers fluid, silent and precise autofocus. This makes it an ideal hybrid tool: while in photography it is fast, in video it eliminates sudden jumps and mechanical noises, allowing much more organic and professional face or subject tracking.

Summary

The EF 40mm f/2.8 STM from Canon is one of the most unique and beloved pieces of engineering in the EF ecosystem, standing out mainly for its "pancake" design that reduces its thickness to just over two centimeters. Despite its tiny appearance and weight of just 130 grams, this lens does not sacrifice optical quality; It incorporates an aspherical element and specialized coatings that achieve surprising sharpness from its maximum aperture of f/2.8. Its construction is remarkably solid, with a metal frame that distances it from the feeling of fragility of other inexpensive lenses from the brand.

One of its greatest technical innovations is the inclusion of the stepping motor (STM), which allows fluid, precise and practically silent autofocus. This technology is especially valuable for content creators using cameras with hybrid focus systems, as it prevents harsh mechanical noises during video recording. In addition, its focal length of 40mm offers a very natural perspective, placing itself in the "sweet spot" between the wide angle of a 35mm and the normal vision of a 50mm, which makes it an extremely versatile tool for capturing reality as perceived by the human eye.

Regarding its practical applications, it is the ideal companion for street and travel photography, as it allows you to maintain a low profile and significantly reduces the total weight of the equipment. Its size makes it perfect for always carrying the camera without it becoming a burden, making it easier to capture spontaneous moments or documentary photography. Likewise, its good optical performance enables it for environmental portraits and light product photography, while its silent motor positions it as an excellent option for vlogging or recording in small spaces where discretion and agility are essential.