Canon EF 300mm f/4L IS USM

Infobox photographic lenses
name = EF 300mm f/4L IS USM


caption = The Canon EF 300mm f/4L IS USM
maker = Canon
feat-is = y
feat-usm = y
feat-sbf =
feat-macro =
feat-special =
type = p
application = Telephoto
flength = 300mm
fov = 35mm
aperture = f/4 - f/32
groups = 11
elements = 15
diaphragm = 8
close-dist = 4.9' / 1.5m
max-mag = ~1:4
weight = 2.6 lbs / 1.19 kg
max-diameter = 3.5" / 9.0 cm
max-length = 8.7" / 22.1 cm
filter = 77 mm
hood = Built-In
case = LZ1128
av-horiz = 6°50'
av-vert = 4°35'
av-diag = 8°15'
start = March 1997
msrp = $1,853
category = Canon EF lenses

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. [ [http://the-digital-picture.com/Reviews/Canon-EF-300mm-f-4.0-L-IS-USM-Lens-Review.aspx the-digital-picture.com] ]

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. [ [http://www.canon.com/camera-museum/camera/lens/ef/data/telephoto/ef_300_4lis_usm.html Canon Camera Museum] ] [ [http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&fcategoryid=153&modelid=7316#ModelDetailAct Canon USA] ] [ [http://software.canon-europe.com/files/documents/EF_Lens_Work_Book_11_EN.pdf EF LENS WORK III DESIGN SPECIFICATIONS & LENS MAPS] ]

ee also

*Canon EOS
*Canon EF lens mount
*Canon L lens

References