Understanding the Geometry in OpticStudio Curvature Cross-Section Analysis

This article explains the geometry behind the OpticStudio curvature cross-section analysis. Two important aspects to understand are

  • the conventions used for the tangential and sagittal curvature directions, and
  • the placement of the cross-section in situations where the aperture is decentered.
A point of possible confusion is clarified for situations when the surface is not rotationally symmetric and the tangential and sagittal curvature becomes multi-valued at the surface vertex due to the arbitrary choice of the tangential direction at that point.

Authored By: Shawn Gay

Published On: June 10, 2016

Zemax Narcissus Analysis Macro


This article will demonstrate how to analyse narcissus effect in infrared systems with cooled detectors. In summary:

  • Ghost files generated with Zemax ghost generator are loaded and for each file vignetting and transmission data are gathered
  • According to user input temperature data (housing, detector and ambiant) narcissus integral coefficient is calculated
  • Surface NITD contributions and total NITD results are displayed
  • All numeric NITD data are written into a text file

Authored By: Serhat Hasan, shaslan@aselsan.com.tr

Published On: July 13, 2013

Why Are FFT and Huygens MTF Results Different on Tilted Image Surfaces?

An explanation of why FFT MTF and Huygens MTF yield different results in system with tilted image surfaces.


Published On: December 23, 2015

What is the Difference Between the FFT and Huygens PSF?

This article discusses the Huygens and the FFT PSF computations, gives a quick test of validity of the FFT PSF, and concludes with a list of system parameters which require the use of the Huygens calculation.

Authored By: Betsy Goodwin

Published On: October 30, 2015

How to Use the Center of Curvature Report to Aid System Alignment

Centered optical systems are relatively easy to design and align, but when decentered and tilted surfaces are used , alignment becomes difficult unless you have a plan. This article describes how to use the Center of Curvature report to give the necessary datums for system alignment.

Authored By: Bob Parks

Published On: July 31, 2006

Performing Partially Coherent Image Analysis

This article explains:
  • What Partially Coherent Image Analysis is
  • What different types of partial coherence Gamma functions are available
  • The two different computations methods that can be used for partial coherence
  • What sampling issues to watch out for when performing partially coherent analysis


Authored By: Andrew Locke

Published On: December 23, 2015

How to Reverse an Optical System

This article explains how to use the Reverse Elements tool to reverse an entire sequential optical system.

Authored By: Andrew Locke

Published On: December 8, 2015

How to Use the Quick Adjust Tool and Slider

The Quick Adjust tool is invaluable during early system setup, letting you easily adjust important surface data to achieve a variety of conditions. This article describes how to use it, and its related feature, the Slider.

Authored By: Mark Nicholson

Published On: December 1, 2015

How to Include Detector Resolution in MTF Calculations

MTF is commonly used to describe the performance of an imaging system, but the finite resolution of the detection system is often ignored. This article describes how to account for detector pixel sizes and position shifts to give a full-system MTF measurement.

Authored By: Mark Nicholson

Published On: May 2, 2008

How to Produce Photorealistic Output Images

This article describes how to take high-resolution .BMP or .JPG images and ray-trace them through a sequential optical system. The resulting high resolution, photo-realistic images provide compelling evidence of final system performance, and can help to communicate that performance to non-optics specialists.

Authored By: Mark Nicholson

Published On: July 31, 2006

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