Telephoto lens system

Details Telephoto lens system Telephoto lens system

1988-02-08

1989-03-14

Corbin, John K.

G02B 1302, G02B 964

Patent

active

048120260

ABSTRACT:
A bright and very compact telephoto lens system which is capable of effective aberrational compensation at infinity and with minimal aberrational variations when focused at near distances using inner focusing. The lens system includes a first lens group having a positive refractive power, a second lens group having a positive refractive power and a third lens group having a negative refractive power. The first lens group is composed of a positive first lens element, a positive second lens element, a negative third lens element and a positive fourth lens element. The second lens group includes a cemented positive lens in which a positive fifth lens element is cemented to a negative sixth lens element. The third lens group is composed of a cemented negative lens in which a positive seventh lens element is cemented to a negative eighth lens element, and a positive meniscus ninth lens element having a convex surface directed toward the object side.

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