Anamorphic photography for digital imagers

Patent metadata

Field	Value
Publication number	US-2017192210-A1
Application number	US-201615394401-A
Country	US
Kind code	A1
Filing date	Dec 29, 2016
Priority date	Jan 6, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

A digital camera comprising a digital image sensor and at least one corrective lens element configured to reduce a blurring of an image in a horizontal or vertical dimension on the digital image sensor. Preferably the digital image sensor is a large digital imager such as a Digital 65 imager.

First claim

What is claimed is:

1 . A digital camera comprising:
a digital image sensor; a lens group positioned along an optical axis and including:
at least one anamorphic lens element configured to compress an image in a horizontal or vertical dimension;
at least one powered lens element positioned between the at least one anamorphic lens element and the digital image sensor; and
at least one corrective lens element positioned between the at least one powered lens element and the digital image sensor, and configured to reduce a blurring of the image in the horizontal or vertical dimension on the digital image sensor or decomposition the image in the horizontal or vertical dimension to substantially equalize the image quality in the horizontal and vertical dimension.

2 . The digital camera of claim 1 , wherein the at least one corrective lens element includes at least one toroidal lens element.

3 . The digital camera of claim 1 , wherein the at least one corrective lens element includes at least one birefringent material.

4 . The digital camera of claim 1 , wherein the digital image sensor has an active imaging area with a width along the horizontal or vertical dimension that is greater than about 35 millimeters.

5 . The digital camera of claim 4 , wherein the digital image sensor has an active imaging area with a height that is greater than about 20 millimeters.

6 . The digital camera of claim 1 , wherein the digital image sensor includes an optical low-pass filter, the at least one corrective lens element being configured to reduce a blurring of the image in the horizontal or vertical dimension on the digital image sensor caused by the optical low-pass filter.

7 . The digital camera of claim 1 , wherein the at least one anamorphic lens element is configured to compress the image in the horizontal or vertical dimension by a squeeze ratio of approximately 1.29.

8 . The digital camera of claim 1 , wherein the at least one corrective lens element includes a combination of at least one toroidal lens element and at least one birefringent material.

9 . The digital camera of claim 1 , wherein the at least one anamorphic lens element is configured to detach from the at least one powered lens element.

10 . The digital camera of claim 1 , wherein the digital camera is configured to alter between an anamorphic capture mode and a non-anamorphic capture mode.

11 . A digital camera system comprising:
a digital image sensor including an optical low pass filter; at least one anamorphic lens element configured to compress an image in a horizontal or vertical dimension; and at least one corrective lens element configured to be positioned along an optical axis between the at least one anamorphic lens element and the optical low pass filter, and configured to reduce a blurring of the image in the horizontal or vertical dimension on the digital image sensor caused by the optical low-pass filter.

12 . The digital camera system of claim 11 , wherein the at least one corrective lens element is configured to correct one or more of a spherical aberration, a coma, a field curvature, or an astigmatism caused by the optical low-pass filter.

13 . The digital camera system of claim 11 , wherein the at least one corrective lens element includes a birefringent material.

14 . The digital camera system of claim 11 , wherein the at least one corrective lens element includes at least one toroidal lens element.

15 . The digital camera system of claim 11 , wherein the at least one anamorphic lens element is configured to compress the image in the horizontal or vertical dimension by a squeeze ratio of approximately 1.29.

16 . A digital camera system comprising:
at least one anamorphic lens element configured to compress an image in a horizontal or vertical dimension by a squeeze ratio of approximately 1.29; and a digital image sensor configured to receive the image compressed by the at least one anamorphic lens element.

17 . The digital camera system of claim 16 , wherein the digital image sensor is configured to receive the image at a 1.78:1 aspect ratio.

18 . The digital camera system of claim 16 , wherein the digital image sensor is configured to receive the image at a 2.2:1 aspect ratio.

19 . The digital camera system of claim 16 , wherein the digital image sensor has at least a 4K resolution.

20 . The digital camera system of claim 16 , wherein the digital image sensor has an active imaging area with a width along the horizontal or vertical dimension that is greater than about 35 millimeters.

Assignees

• Panavision Int Lp

Inventors

• Sasaki Daniel Keith
• Macintosh David William
• Sadahiro Haluki

Classifications

• G02B13/08 Primary

  Anamorphotic objectives · CPC title

• G02B7/09

  adapted for automatic focusing or varying magnification · CPC title

• G02B27/0025

  for optical correction, e.g. distorsion, aberration · CPC title

• G03B37/06

  involving anamorphosis (G03B37/02, G03B37/04 take precedence) · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title