“Canon EF 100–300mm lens”的意思、由来-开放百科全书

The EF 100–300mm refers to three telephoto zoom lenses produced by Canon. They are of the EF lens mount that is compatible with the EOS line of cameras.

The two 5.6 versions were contemporaries, launched at the beginning of the Canon EOS system. The L version had a different optical construction which improved sharpness, color, and chromatic aberrations. Otherwise the lenses were physically similar. Canon decided to upgrade the non-L version in the early 1990's to the 4.5-5.6 version, not the L. It had improved styling, a ring zoom control instead of push-pull, and a larger (faster) aperture at the wider end. It also made use of a much faster and much quieter Ultrasonic ("USM") motor for autofocus control, instead of the Arc-Form Drive ("AFD") found on the 5.6 lenses. The L version never received this upgrade, and it lasted long after the 5.6 non-L had been discontinued. Following Canon practice, the L lens was sold including its lens hood and protective case.

Lenses

Attribute

{{f/5.6 ^[1]

{{f/5.6L^[2]

{{f/4.5–5.6 USM^[3]

Image stabilizer

Ring USM

Yes

L-series

Yes

Diffractive Optics

Ultra-low dispersion glass element

Yes

Synthetic Fluorite glass element

Yes

Macro

Yes

Short back focus

Maximum aperture

{{f/}}5.6

{{f/}}4.5–5.6

Minimum aperture

{{f/}}32

{{f/}}40

Weight

685 g

695 g

540 g

Max. Diameter x Length

75 mm x 166.8 mm

75 mm x 166.6 mm

73 mm x 121.5 mm

Filter diameter

58 mm

Horizontal viewing angle

20°–6°50'

Vertical viewing angle

14°–4°35'

Diagonal viewing angle;

24°–8°15'

Groups/elements

9/15

10/15

10/13

# of diaphragm blades

Closest focusing distance

2 m

1.5 m

Currently in production?

Release date

March 1987

June 1987

June 1990

References

1. ^{{cite web|url=http://global.canon/en/c-museum/product/ef262.html|title= EF100-300mm f/5.6|work=Canon Camera Museum|author=Canon Inc.|accessdate=2016-05-18}}
2. ^{{cite web|url=http://global.canon/en/c-museum/product/ef266.html|title= EF100-300mm f/5.6L|work=Canon Camera Museum|author=Canon Inc.|accessdate=2016-05-18}}
3. ^{{cite web|url=http://global.canon/en/c-museum/product/ef290.html|title= EF100-300mm f/4.5-5.6 USM|work=Canon Camera Museum|author=Canon Inc.|accessdate=2016-05-18}}

Lenses

References

External links