Photographic optical device with variable magnification

Details Photographic optical device with variable magnification Photographic optical device with variable magnification

1987-02-27

1989-10-03

Arnold, Bruce Y.

G02B 1502

Patent

active

048712388

ABSTRACT:
A photographic optical device of this invention comprises: a master lens unit having a positive refractive power, determining a photographic optical path and moving along the optical axis to change magnification; a first auxiliary lens unit having a positive refractive power and being capable of being placed on and off the optical path; and a second auxiliary lens unit having a negative refractive power and being capable of being placed on and off the optical path. The first auxiliary lens unit is attached to an image-plane side of the master lens unit to form a photographic unit giving a low ratio of magnification. The second auxiliary lens unit is attached to an image-plane side of the master lens unit to form another photographic unit giving a high ratio of magnification. The first and second auxiliary lens units are placed outside of the optical path to form another photographic unit giving a middle ratio of magnification.

REFERENCES:
patent: 2256228 (1941-09-01), Zimmermann
patent: 3741621 (1973-06-01), McCrobie
patent: 4643536 (1987-02-01), Yamada et al.

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