Anamorphic converter, lens device using the same, and...

Details Anamorphic converter, lens device using the same, and... Anamorphic converter, lens device using the same, and...

2006-09-26

2006-09-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Anamorphic

C359S671000, C359S672000

Reexamination Certificate

active

07113344

ABSTRACT:
An anamorphic converter, which can be inserted into and removed from a lens group of an image-formation optical system, includes an anamorphic lens that satisfies the following conditionsin-line-formulae description="In-line Formulae" end="lead"?0.9<(AR1·βx)/(AR2·βy)<1.1in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(AR22+1)·βy2/(AR12+1)>1in-line-formulae description="In-line Formulae" end="tail"?wherein βx represents a first focal distance magnification scale at a first cross-section containing an optical axis of the anamorphic lens, βy represents a second focal distance magnification scale at a second cross-section which is perpendicular to the first cross-section and contains the optical axis, AR1represents an aspect ratio of an image-taking range in a field of the image-formation optical system, and AR2represents an aspect ratio at an effective range of an image-taking unit disposed at an object image side of the lens group. As such, there is provided an anamorphic converter which is small and has high optical performance, suitable for digital cinematography.

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