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Canon EF 300mm f/4.0L USM

Canon EF 300mm f/4.0L USM 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.


Ultrasonic AF

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


No 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.


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.

A more portable 300mm telephoto lens. Two UD-glass elements effectively correct secondary spectrum. Superb resolution and contrast. Astigmatism is also corrected, and background blur is soft and nice. Built-in hood with a locking mechanism.

Canon EF 300mm f/4.0L USM Specification

Available mount(s) Canon EF
Application(s) Sports, Wildlife
Category(s) Super telephoto
Stabilizer no
Focal length 300 mm (prime)
Lens construction 8 elements in 7 groups
Angle of view 35mm: 8.25°
digital: N/A
Number of blades 8
Maximum aperture f/4
Minimum aperture f/32
Minimum focusing distance 250 cm
Magnification 0.13×
Filter size N/A
Size ∅ 90 × 213.5 mm
Weight 1165 g
Notes AF Actuator: USM, Mechanical full-time manual focusing built-in. Lens hood built-in.
AF speed N/A
AF sound
Internal focusing yes
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed N/A
Drop in filter N/A
Ultrasonic AF yes
Stepping motor AF no
APS-C sized circle no
Low dispersion lens element N/A
Hard case N/A
Soft case N/A
Lens hood N/A
Tripod adapter N/A
Discontinued yes
Canon EF 300mm f/4.0L USM Specification

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