Internal focusing telephoto lens

Details Internal focusing telephoto lens Internal focusing telephoto lens

1993-08-23

1994-06-21

Sikes, William L.

Optical: systems and elements

Lens

Telephoto

359745, 359747, G02B 1302

Patent

active

053232704

ABSTRACT:
An internal focusing telephoto lens includes, in succession from the object side, a first lens unit of positive refractive power having at least a positive first lens component, a second lens unit having negative refractive power and movable along the optical axis for focusing, and a third lens unit having positive refractive power and having an imaging function. The first lens unit forms a substantially afocal system with the second lens unit, and is designed to satisfy the following conditions:

REFERENCES:
patent: 4113357 (1978-09-01), Nakamura
patent: 4709998 (1987-12-01), Yamanashi
patent: 4732459 (1988-03-01), Hayashi

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