|EF||Autofocus lens designed both for Canon full frame and APS-C SLR cameras.|
|STM||The lens is equipped with stepping motor to provide smooth, fast and virtually silent autofocus. Learn more|
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|Maximum format:||35mm full frame|
|Diagonal angle of view:||56.8° (35mm full frame)
46.1° (Canon APS-H)
37.6° (Canon APS-C)
|Lens construction:||6 elements in 4 groups, including 1 ASPH|
|Closest focusing distance:||30 cm|
|Number of diaphragm blades:||7|
|Type of autofocus motor:||Stepping (Canon EF)
|Full-Time Manual Focus:||Yes|
|Maximum diameter x Length:||Ø68.2 x 22.8 mm|
|Materials:||Plastic barrel, metallic mount|
|Filter size:||52 mm|
Design and Features
Canon’s first pancake lens for DSLR cameras.
At first sight, focal length of 40 mm seems a bit unusual (for those who accustomed to traditional focal lengths of 35 or 50 mm), however pancake lenses with such focal length can be easily found, for example, in Pentax lineup - smc Pentax-DA 40mm F/2.8 Limited (2004), smc Pentax-DA 40mm F/2.8 XS (2012) and HD Pentax-DA 40mm F/2.8 Limited (2013), or in Cosina’s lineup of manual focus lenses - Cosina Voigtlander Ultron 40mm F/2 Aspherical SL II (2007). On full frame cameras 40 mm lenses provide more natural perspective to images compared to standard prime lenses with focal lengths of 50-55 mm.
Canon EF 40mm F/2.8 STM is also company’s first lens to feature stepping motor - a motor that is driven in synchronization with pulse power, and rotates one step per electrical pulse. Therefore, it is sometimes referred to as a pulse motor. It’s a simple, lightweight and reliable autofocus motor with excellent start-stop response and controllability. Canon currently uses two types of stepping motors:
- STM + Gear Type has helical gears with angled edges in the gear unit to realize more silent and smooth autofocus during video recording than a micromotor. This STM is not totally silent though – the camera microphone can pick up the focusing noise in a quiet environments. On the other hand, it allows for compact lens designs, that’s why it was used, for example, in such lenses as Canon EF 40mm F/2.8 STM and Canon EF 50mm F/1.8 STM.
- STM + Lead Screw Type is a simple direct drive mechanism that moves the lens barrel to realize truly silent and smooth autofocus during video recording. This type of stepping motor, however, is too large to fit inside compact prime lenses and currently used in Canon’s zoom lenses.
Since both types offer smooth transfer of focus from one point to the other, STM lenses are especially suitable for video recording compared to other types of Canon autofocus motors, though excluding Nano USM – a completely new type of ultrasonic motor introduced in 2016 which combines very compact design and near silent operation with fast speed for shooting stills and smooth focus transfer for video recording. To the date, the only lens which uses Nano USM is Canon EF-S 18–135mm F/3.5–5.6 IS USM.
Now back to the Canon EF 40mm F/2.8 STM. Overall the lens is very inexpensive and ideal for movie makers, documentary, action or travel photography. Being a versatile lens, it is also suitable for landscape and even portrait photography.
The lens barrel is compact, lightweight, made of plastic. The lens mount is metallic. The focusing ring is very slim. The overall build quality is clearly better compared to Canon EF 50mm F/1.8 II (1990).
The focusing ring is not physically coupled with the focusing mechanism and works electronically (focus-by-wire) - turning of the ring actuates an electric motor that moves the focusing group of the lens to the proper position to achieve sharp focus.
The lens features AF/MF focus mode switch.
|AF||Autofocus mode with Full-Time Manual Focus.|
|MF||Manual focus mode.|
Full-Time Manual Focus with lenses equipped with stepping or linear motor is performed in the following way - half-press the shutter button, wait until the camera has finished the autofocusing and then focus manually without releasing the shutter button using the manual focusing ring.
The lens uses front filters with standard size of 52 mm which are easy to find. They are also inexpensive.
It should be noted that most lenses of the system have such diameter of the filter thread, that is why if you will purchase additional lens with similar focal length and/or speed, you probably will be able to share filters between them.
The dedicated lens hood ES-52 is too shallow to block a reasonable amount of stray light or to provide a decent protection from physical impact. It is not a part of the package though.
The lens is equipped with gear type stepping motor, the autofocus is quiet, smooth and fast, which is especially important during video recording.
Aspherical elements (ASPH, XA) minimize spherical aberration, astigmatism, coma and ensure excellent sharpness and contrast even at maximum aperture.
The lens is very sharp across the frame already wide open! The background blur at large apertures is neutral when focusing at medium or large distances but can be pleasant at close distances.
|Camera||Canon EOS 5D mark II||Canon EOS 1Ds mark III|
|Sensor size||36×24 mm||36×24 mm|
|Distortion||-0.57 %||-0.72 %|
|Vignetting at F/2.8||-1.72 EV||-2.1 EV|
|User Manual. English, Adobe PDF, 186 KB|
|User Manual. Русский, Adobe PDF, 123 KB|
|Prime lenses for Canon EOS DSLR cameras|
Alternatives (AF, 35..45 mm)
|Canon EF 35mm F/1.4L II USM||2015||⊗|
|Canon EF 35mm F/1.4L USM||1998||⊗|
|Canon EF 35mm F/2||1990||⊗|
|Canon EF 35mm F/2 IS USM||2012||⊗|
|Sigma 35mm F/1.4 DG HSM | A||2012||⊗|
|Tamron SP AF 35mm F/1.8 Di VC USD F012||2015||⊗|
|Tamron SP AF 45mm F/1.8 Di VC USD F013||2015||⊗|