Mr. Ellis I. Betensky Profile

Mr. Ellis I. Betensky

Retired at

SPIE Involvement:

Publications (18)

SPIE Conference Volume | September 18, 2015

Zoom Lenses V

PROCEEDINGS ARTICLE | September 3, 2015

Understanding how entrance and exit pupils have determined the evolution of the modern zoom lens design (tutorial)

Proc. SPIE. 9580, Zoom Lenses V

KEYWORDS: Chromatic aberrations, Monochromatic aberrations, Optical design, Image compression, Control systems, Lens design, Zoom lenses, Chemical elements, Automatic exposure, Content addressable memory

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PROCEEDINGS ARTICLE | October 19, 2012

The AWMC metric for zoom lens assessment

Proc. SPIE. 8488, Zoom Lenses IV

KEYWORDS: Optical transfer functions, Modulation, Imaging systems, Spatial frequencies, Fourier transforms, Lens design, Image quality, Aspheric lenses, Zoom lenses, Modulation transfer functions

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PROCEEDINGS ARTICLE | October 19, 2012

Fundamental considerations for zoom lens design (tutorial)

Proc. SPIE. 8488, Zoom Lenses IV

KEYWORDS: Optical design, Radon, Patents, Cameras, Sensors, Manufacturing, Computing systems, Lens design, Zoom lenses, Geometrical optics

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SPIE Conference Volume | October 8, 2012

Zoom Lenses IV

PROCEEDINGS ARTICLE | September 27, 2008

Lens design with Forbes aspheres

Proc. SPIE. 7100, Optical Design and Engineering III

KEYWORDS: Telescopes, Optical design, Metrology, Optical spheres, Manufacturing, Lens design, Aspheric lenses, CRTs, Optics manufacturing, Surface finishing

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PROCEEDINGS ARTICLE | August 3, 2006

The past, present, and future of optical design

Proc. SPIE. 6342, International Optical Design Conference 2006

KEYWORDS: Lithography, Monochromatic aberrations, Optical design, Cameras, Glasses, Computing systems, Wavefronts, Lens design, Zoom lenses, Chemical elements

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PROCEEDINGS ARTICLE | August 24, 2005

Forty years of modern zoom lens design

Proc. SPIE. 5865, Tribute to Warren Smith: A Legacy in Lens Design and Optical Engineering

KEYWORDS: Aberration correction, Cameras, Video, Manufacturing, Computing systems, Control systems, Distortion, Lens design, Objectives, Zoom lenses

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PROCEEDINGS ARTICLE | December 14, 2001

Telecentric zoom lens used in metrology applications

Proc. SPIE. 4487, Zoom Lenses III

KEYWORDS: Metrology, Reflection, Manufacturing, Distortion, Iris, Lens design, Objectives, Aspheric lenses, Zoom lenses, Fiber optic illuminators

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PROCEEDINGS ARTICLE | September 21, 1998

Compact wide-range telecentric zoom lens for DMD projectors

Proc. SPIE. 3482, International Optical Design Conference 1998

KEYWORDS: Monochromatic aberrations, Lenses, Glasses, Distortion, Image quality, Projection systems, Zoom lenses, Digital micromirror devices, Modulation transfer functions, Chemical elements

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PROCEEDINGS ARTICLE | September 21, 1998

High-performance wide-angle macrofocus zoom lens for 35-mm cinematography

Proc. SPIE. 3482, International Optical Design Conference 1998

KEYWORDS: Optical components, Monochromatic aberrations, Optical design, Cameras, Distortion, Iris, Lens design, Aspheric lenses, Zoom lenses, Spherical lenses

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PROCEEDINGS ARTICLE | September 21, 1998

Aberration correction and desensitization of an inverse-triplet object lens

Proc. SPIE. 3482, International Optical Design Conference 1998

KEYWORDS: Monochromatic aberrations, Aberration correction, Glasses, Manufacturing, Distortion, Lens design, Objectives, Aspheric lenses, Modulation transfer functions, Tolerancing

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PROCEEDINGS ARTICLE | September 25, 1997

Zoom relay lens for a family of catadioptric objective lenses

Proc. SPIE. 3129, Zoom Lenses II

KEYWORDS: Mirrors, Manufacturing, Control systems, Image sensors, Space mirrors, Objectives, Relays, Dysprosium, Zoom lenses, Combined lens-mirror systems

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SPIE Conference Volume | September 25, 1997

Zoom Lenses II

PROCEEDINGS ARTICLE | October 5, 1995

Zoom lenses for small CCD cameras

Proc. SPIE. 2539, Zoom Lenses

KEYWORDS: Chromatic aberrations, Monochromatic aberrations, Imaging systems, Glasses, Distortion, Lens design, CCD cameras, Zoom lenses, Charge-coupled devices, Modulation transfer functions

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SPIE Journal Paper | August 1, 1993

Postmodern lens design

Betensky, Ellis

OE Vol. 32 Issue 08

KEYWORDS: Lens design, Chemical elements, Genetic algorithms, Gaussian optics, Zoom lenses, Optical design, Modulation transfer functions, Glasses, Aspheric lenses, Optimization (mathematics)

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PROCEEDINGS ARTICLE | July 1, 1992

Zoom lens principles and types

Proc. SPIE. 10263, Lens Design: A Critical Review

KEYWORDS: Lenses, Aspheric lenses, Zoom lenses, Gaussian optics

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PROCEEDINGS ARTICLE | January 1, 1991

Invited paper: Role of aspherics in zoom lens design

Proc. SPIE. 1354, 1990 Intl Lens Design Conf

KEYWORDS: Monochromatic aberrations, Aberration correction, Lenses, Cameras, Video, Lens design, Oxygen, Aspheric lenses, Zoom lenses, Chemical elements

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Showing 5 of 18 publications

Conference Committee Involvement (4)

Zoom Lenses V

11 August 2015 | San Diego, California, United States

Zoom Lenses IV

12 August 2012 | San Diego, California, United States

Zoom Lenses III

31 July 2001 | San Diego, CA, United States

Zoom Lenses II

28 July 1997 | San Diego, CA, United States

Course Instructor

SC381: Introduction to Zoom Lens Design

This course provides attendees with a basic understanding of how various types of zoom lenses function, and particularly the limitations of their optical designs. The emphasis of the course is an understanding of how: the magnification is changed; the image position is stabilized; aberrations result; aberrations are corrected. Existing designs are examined to illustrate the concepts involved. This course shows you how optical design programs work with zoom lenses.

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