Telephoto lens system

Details Telephoto lens system Telephoto lens system

1993-04-09

1994-06-28

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359745, 359748, G02B 1514, G02B 914, G02B 1302

Patent

active

053252349

ABSTRACT:
A telephoto lens system that adopts an inner focusing method and that is capable of satisfactory correction of aberrations while insuring an adequate back focus without increasing the overall lens length. The present telephoto lens system comprises, in order from the object side, a positive first lens group, a negative second lens group and a positive third lens group. The system can be focused on a close-up object by moving the second lens group toward the image. The first lens group comprises a positive first sub-group 1a and a positive second sub-group 1b separated from the first sub-group airspace. The system satisfies the following conditions:

REFERENCES:
patent: 4176913 (1979-12-01), Nakamura et al.
patent: 4437734 (1984-03-01), Iizuka
patent: 4610514 (1986-09-01), Nakamura
patent: 4666260 (1987-05-01), Itoh
patent: 4852984 (1989-08-01), Takahashi et al.
patent: 4874231 (1989-10-01), Aono

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