David P. Biss, Ph.D. The modulation transfer function (MTF) provides vital information about the imaging performance of an optical system. Measuring the MTF of a lens or lens assembly is a reliable way to assess lens quality and is used across multiple industries, including defense, automotive, … [Read more...]
Afocal MTF Measurement
David P. Biss, Ph.D. and Roy Youman Afocal systems, by definition, produce a virtual image projected from infinity (i.e., the output beam is collimated). Examples include visual optical devices such as binoculars and riflescopes, and afocal adapters that increase the focal length of camera … [Read more...]
Stray Light Measurement on LensCheck™ Lens Measurement Systems
Haskell Kent, Optikos Corporation Print This Article Manufacturers are asking vision systems to take on more and more challenging imaging tasks across non-ideal imaging environments. Many applications require imaging scenes with extraordinarily high dynamic range content. For example, … [Read more...]
Calibrating The Thermal Camera
As thermal cameras gain ground in the commercial market, testing becomes critical Dr. David A. Imrie, Optikos Corp. Print This Article Thermal imaging, once the domain of the defense sector, is finding applications in a number of commercial and medical fields. As more manufacturers join the … [Read more...]
Why Measure MTF?
Why measure MTF? By Peter T. Carellas and Stephen D. Fantone Print This Article Modulation Transfer Function (MTF) has been also cited with measurement of performance of optical systems from the initial introduction of linear system analysis to this field. As the demand for … [Read more...]
Evaluating and Comparing Camera Performance
By: Dr. Stephen D. Fantone, Dr. David Imrie and Dr. Jian Zhang Print This Article With cameras being used in applications ranging from consumer products such as PDAs, automotive rear viewing systems, and medical devices to military applications including thermal imaging and ranging systems, … [Read more...]
Finding Focus
The choice of criterion for determining best focus depends on the application. BY ROY YOUMAN Print This Article When testing lenses and optical systems, it is best to simulate the conditions of use while testing. Set the object conjugate correctly (infinite or finite), choose the correct … [Read more...]
MTF Metrology for High -NA Microscope Objectives
Peter Domenicali and Stephen D. Fantone, Optikos Corporation Microscope objectives represent an interesting case in the field of imaging performance metrology. In a parallel to mainstream photographic lenses, users of microscope objectives typ ically are more concerned with subjective … [Read more...]
How to Measure MTF
How to Measure MTF and other Properties of Lenses July 16, 1999 © Optikos Corporation, 1999 All Rights Reserved Print This Article Introduction With the growing role played by optical devices in measurement, communication, and photonics, there is a clear need for characterizing optical … [Read more...]