Canon EF 300mm f/4L IS USM
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| EF 300mm f/4L IS USM | |
 The Canon EF 300mm f/4L IS USM |
|
| Key features | |
|---|---|
| Maker: | Canon |
| Image stabilization: |  Yes |
| Ultrasonic motor: | Yes |
| Application: | Telephoto |
| Technical data | |
| Type: | Prime |
| Focal length: | 300mm |
| Frame coverage: | 35mm |
| Aperture (max/min): | f/4 - f/32 |
| Construction: | 11 groups / 15 elements |
| # Diaphragm blades: | 8 |
| Close focus distance: | 4.9' / 1.5m |
| Max. magnification: | ~1:4 |
| Physical | |
| Max. diameter: | 3.5" / 9.0 cm |
| Max. length: | 8.7" / 22.1 cm |
| Weight: | 2.6 lbs / 1.19 kg |
| Filter diameter: | 77 mm |
| Accessories | |
| Lens hood: | Built-In |
| Case: | LZ1128 |
| Angle of view | |
| Horizontal: | 6°50' |
| Vertical: | 4°35' |
| Diagonal: | 8°15' |
| History | |
| Introduced: | March 1997 |
| Retail info | |
| MSRP US$ | $1,853 |
The EF 300mm f/4L IS USM lens is a telephoto prime lens made by Canon Inc.
This lens has an EF type mount, that fits the Canon EOS line of cameras.
When used on a digital EOS body with a field of view compensation factor of 1.3x, such as the Canon EOS-1D Mark III, it provides a narrow field of view, equivalent to an 390 mm lens mounted on a 35mm frame body. With a 1.6x body such as the Canon EOS 400D, it provides a narrower field of view, equivalent to an 480 mm lens mounted on a 35mm frame body.
This lens is most commonly used by sports and wildlife photographers, but is short enough to be use for extreme close-up portraits. And because of its rather high native magnification, it can be used for some macro type photography.
[edit] Technical information
The EF 300mm f/4L IS USM is a L series lens, that was designed to replace the Canon EF 300mm f/4L USM. This lens is constructed with a metal body and mount, and with plastic extremities and switches. Features of this lens are: a wide rubber focus ring that is damped, a distance window, the ability to limit the focus range, and a image stabilizer that is effective up to two stops. An 8 blade, maximum aperture of f/4, gives this lens the ability to create shallow depth of field effects. The optical construction of this lens contains 15 lens elements, including two UD (Ultra low Dispersion) lens elements. This lens uses an inner focusing system, powered by a ring type USM motor. The front of the lens does not rotate nor extend when focusing. This lens is compatible with the Canon Extender EF teleconverters.
[edit] See also
[edit] External links and references
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