Telephoto lens system having an improved focusing capability

Details Telephoto lens system having an improved focusing capability Telephoto lens system having an improved focusing capability

1977-03-21

1978-11-21

Clark, Conrad J.

350215, 350216, G02B 1302

Patent

active

041263782

ABSTRACT:
A telephoto lens system having improved focusing capabilities is provided wherein a first lens group of an overall positive refractive power is mounted on the object side of a second lens group of an overall negative refractive power. The lens components of the second lens group are capable of providing a simplified focusing mode of operation. The second lens group can comprise a first negative lens component and an image side second positive lens component. The second positive lens component is movably mounted for focusing the entire lens system on relatively close objects as its translates toward the object side. The first lens group is spaced a distance from the second lens group having an absolute value greater than 0.15f wherein f is the focal length of the entire lens system. Additionally, the composite absolute values of the focal lengths of the front lens group and the negative lens component of the second lens group is greater than 1.2f.

REFERENCES:
patent: 3868174 (1975-02-01), Yakota
patent: 3966307 (1976-06-01), Tojyo

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