Large-aperture medium-range telephoto lens system

Details Large-aperture medium-range telephoto lens system Large-aperture medium-range telephoto lens system

1995-06-15

1997-05-06

Fields, Carolyn E.

Optical: systems and elements

Lens

Telephoto

359684, 359748, G02B 1302

Patent

active

056276869

ABSTRACT:
In a large-aperture medium-range telephoto lens system, which includes, in the following order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power, and attains focusing by moving the second and third lens units along the optical axis while the first lens unit is fixed in position, the telephoto lens system satisfies:

REFERENCES:
patent: 4534626 (1985-08-01), Mihara
patent: 4609263 (1986-09-01), Imaizumi

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