1985-06-28
1987-02-17
Corbin, John K.
350474, G02B 912, G02B 1502
Patent
active
046435360
ABSTRACT:
A conversion lens upon attachment on the image side of a master lens increases the focal length of the entire system. The conversion lens comprises three components of negative, positive and negative powers in this order from the front, has a negative power as a whole, and satisfies the following conditions:
REFERENCES:
patent: 4264151 (1981-04-01), Okano
Nakayama Hiroki
Oizumi Kouji
Sato Yasuhisa
Yamada Yasuyuki
Canon Kabushiki Kaisha
Corbin John K.
Gass Rebecca D.
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