Canon EF 300mm f/2.8L IS USM

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Canon EF 300mm f/2.8L IS USM

From the manufacturer

Telephoto lens newly equipped with an Image Stabilizer enabling hand-held shooting for easier movement. The fluorite element and two UD-glass elements effectively correct the chromatic aberrations prone to occur with telephoto lenses. With the EOS-1v and EOS-3, the AF speed becomes the world’s fastest. To reduce the overall weight and enhance portability, the lens barrel and many other exterior parts use a magnesium-alloy. Also, the detachable tripod collar revolves smoothly and locks securely.

url to full description on Manufacturer's web site.
From Wikipedia

The EF 300mm is a L series lens. 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 an image stabilizer (on the IS versions). The maximum aperture of f/2.8 or f/4 gives this lens the ability to create shallow depth of field effects, while the eight- or nine-blade diaphragm produces smooth background blur. The optical construction of this lens contains 15 lens elements, including two UD (Ultra low dispersion) lens elements for the f4 IS USM (for other configurations see chart). 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.[2][3][4]

url to full article on Wikipedia.
MSRP 4879 US$ Aperture (large) f/2.8
Announced 1987 Magnification x
Length 252mm Minimum focusing distance 3.0m
Weight 2550gr Focal 300 mm
Filter diameter mm Diaphragm blades 8
Manufacturer Canon Color White
Mount Type Canon EF Category Prime, Super telephoto
Published reviews
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WEathersealing, CIrcular aperture, FUll time manual focus, STabilization, FT:Filter threads, COnstant minimum aperture,
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2015-03-12T05:11:27+00:00