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## ZPL Macro for Scaling the Weight of a Range of Optimization Operands

This article introduces a quick and simple macro that can be used to scale the weighting of a range of optimization operands.

Authored By: Dan Hill

Published On: September 24, 2015

## Zemax Diffractive Optical Element Sag Macro

This article explains how to measure the sag of a diffractive optical element using a sag macro in OpticStudio.

Authored By: Serhat Hasan ASLAN

Published On: June 24, 2015

## Why is the Optical Performance Sometimes Different at the Image Surface Versus a Co-Located Surface?

This article explains why you may see different results at two co-located surfaces that are at the same location in space, when one of the surfaces is the image surface.

Authored By: Andrew Locke

Published On: December 25, 2015

## 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

## How to Modify String Variables in ZPL Macros

• How to use the $LEFTSTRING(A$, n) and $RIGHTSTRING(A$, n) string fuctions
• How these functions can be combined together to effectively scan and modify string variables

Authored By: Andrew Locke

Published On: August 23, 2006

## 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

## Zemax OpticStudio 30-Day Money-Back Guarantee

What is the Zemax OpticStudio 30-Day Money-Back Guarantee?

## How To Use the ZRDPLAYBACK Keyword To Obtain Filtered Results

This article describes use of the ZPL keyword ZRDPLAYBACK to restore data from a previously saved ZRD file onto detectors in a non-sequential system. Analysis of the data can then be undertaken using the standard non-sequential functions (e.g. NSDD, NSDE, etc.). Using ZRDPLAYBACK, the saved data may be optionally filtered prior to analysis.

Published On: June 29, 2011

## How to Use the Modify Reference Objects Tool

This article explains how to use the Modify Reference Object Tool to tidy up multiple reference points and to define new pivot points in a non-sequential design

Authored By: Mark Nicholson

Published On: February 23, 2007