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Canon EF 40mm f2.8 STM

Canon EF 40mm f2.8 STM lens
Canon EF 40mm f2.8 STM lens
 

Full frame sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.

 

No Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

Stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

 

Metal mount

Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important.

 

No Internal Focusing

Internally focusing lenses don't change their size while setting focus.

 

The front lens is fixed

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.

 

No drop-in filter support

Drop-in filters are used in those lenses where either the front lens is too large, or the field of view doesn't permit the use of traditional filters at the front of the lens. Usually bright tele and ultra-wide angle lenses support this filter type.

Canon EF 40mm f2.8 STM Specification

Available mount(s) Canon EF
Application(s) Landscape, Architecture
Category(s) Standard prime
Multiplier
Stabilizer no
Focal length 40 mm (prime)
Lens construction 6 elements in 4 groups
Angle of view 35mm: 57°
digital: N/A
Number of blades 7
Maximum aperture f/2.8
Minimum aperture f/22
Minimum focusing distance 30 cm
Magnification 0.18×
Filter size 52 mm
Size ∅ 68.2 × 22.8 mm
Weight 130 g
Notes STM - Stepping Motor AF
AF speed N/A
AF sound
Internal focusing no
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed N/A
Drop in filter no
Ultrasonic AF no
Stepping motor AF yes
APS-C sized circle no
Low dispersion lens element N/A
Hard case N/A
Soft case LP811 (not included)
Lens hood ES-52 (not included)
Tripod adapter N/A
Canon EF 40mm f2.8 STM Specification

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