G - Physics – 02 – B
Patent
G - Physics
02
B
88/101
G02B 13/08 (2006.01)
Patent
CA 2012593
A b s t r a c t 1. An anamorphic attachment (3) for purposes of filing and reproduction to be used in conjunction with a basic lens (2). At the attachment (3) there is a first subsystem (8) corving the main purpose of enlargement in a first direction and a second subsystem (7) serving the main purpose of enlargement in a direction vertical to the first direction. The first subsystem (8) contains a positive front lens group (12) and a negative rear lens group (13). The second subsystem (7) a negative front lens group (9) and a positive rear leans group (10). The second subsystem (7) is located between the first subsystem (8) and the basic lens (2), providing that the adjacent negative lens groups (13, 9) of the the two subsystems (8, 7) may also be enchanged. If the basic lens (2) is set to a focal length Fg and the attachment to the object distance "infinity" and the total focal length is V1 . Fg in the first direction and the total focal length V2 ? Fg in the second direction, the attachment is devised in a way that the condition. (V1/V2)2 ? 0.85 ? V1 < V2 ? 1.15 ? (V2/V1)2 is complied with.
Goudreau Gage Dubuc
Isco Optic Gmbh
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