Attachment lens system

Details Attachment lens system Attachment lens system

1991-04-18

1993-06-08

Arnold, Bruce Y.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359672, 359675, G02B 1502

Patent

active

052184757

ABSTRACT:
An attachment lens system comprising, in the order from the object side, a first lens unit having a positive refractive power and a second lens unit having a negative refractive power; having a negative refractive power as a whole; and adapted in such a manner that magnification thereof is changed by moving at least one of the first lens unit and the second lens unit along the optical axis so as to vary the airspace reserved between these lens units. This attachment lens system composes a lens system having a high vari-focal ratio when combined with a master lens system.

REFERENCES:
patent: 4391493 (1983-07-01), Tajima et al.
patent: 4810071 (1989-03-01), Tsuchida et al.
patent: 4818083 (1989-04-01), Mihara

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