Optical: systems and elements – Lens – Anamorphic
Patent
1990-03-22
1993-02-09
Dzierzynski, Paul M.
Optical: systems and elements
Lens
Anamorphic
359672, G02B 1308
Patent
active
051848805
ABSTRACT:
An anamorphic attachment (3) for purposes of filming and reproduction to be used in conjunction with a basic lens (2). At the attachment (3) there is a first subsystem (8) serving 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 lens 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 two subsystems (8, 7) may also be exchanged. 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.multidot.Fg in the first direction and the total focal length V2.multidot.Fg in the second direction, the attachment is devised in a way that the condition (V1/V2).sup.2 .multidot.0.85.ltoreq.V1<V2.ltoreq.1.15.multidot.(V2/V1).sup.2 is complied with.
REFERENCES:
patent: 3041935 (1962-07-01), Jacobsen
Dzierzynski Paul M.
Isco Optic GmbH
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