Internal focusing telephoto lens system

Details Internal focusing telephoto lens system Internal focusing telephoto lens system

1995-06-21

1997-03-11

Sugarman, Scott J.

Optical: systems and elements

Lens

Telephoto

359755, G02B 1302, G02B 964

Patent

active

056107692

ABSTRACT:
An optical system 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, the second lens unit comprising, in the following order from the object side, a front lens group of a negative refractive power and a rear lens group of a negative refractive power, and a third lens unit having a positive refractive power. In the optical system, focusing to a short-distance object is attained by moving the second lens unit toward the image side, and the optical system satisfies:

REFERENCES:
patent: 4113357 (1978-12-01), Nakamura
patent: 4176913 (1979-12-01), Nakamura et al.
patent: 4534626 (1985-08-01), Mihara
patent: 5323270 (1994-06-01), Sato
patent: 5438455 (1995-08-01), Nakatsuji et al.
patent: 5490014 (1996-02-01), Suzuki

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