Have you had a chance to consider David’s points. I think he gets to the heart of the matter. In normal usage, the definitions of the chief ray as passing through the center of the aperture stop or one of the pupils are absolutely identical. OpticStudio does expand on this a bit, in that if vignetting factors are applied, then the vignetted pupil may not be the aperture stop exactly. You can find this discussion in the help page ‘Chief Ray’ in the section Conventions and Definitions, as well as the link to the vignetting factors help page.

Chief rayangle

I don’t think the definitions are different between ZEMAX and classical textbooks. I can see why it can be confusing sometimes. For example, in the University of Arizona figure, the entrance pupil is on the image side, and this might not be so intuitive at first glance (perhaps think of the entrance pupil as a virtual image of the aperture stop in this instance).

If you have any examples of how the differing definitions can cause further difficulties, please don’t hesitate to let us know.

Chief rayangle vs field of view

Sep 16, 2022 — 4.2.5 Half-Wave Plates. A half-wave plate introduces a phase shift of π, so its Jones matrix is MHWP=(100−1),. because exp(iπ)=−1. An ...

I’m thinking that because OpticStudio is a piece of software rather than a century-old definition from the days of paper-and-pencil design, it made sense to have a more expansive definition. I don’t know this for sure, but it seems a likely explanation. The CR as ray through center of AS is going to be a subset of the possible CRs when vignetting is applied.

Focalray

For systems with signification pupil aberrations (Analyze > Aberrations > Pupil Aberrations), the ray in the center of the EP will not go through the center of the Stop.

Thorlabs' laser diodes are available in a wide variety of packages: TO can sizes from Ø3.8 mm to Ø9.5 mm, fiber-pigtailed TO cans, butterfly, ...

the chief ray, by SPIE and Arizona University, is defined to pass through the center of the aperture stop. whereas, is defined to pass through the center of the entrance pupil. the difference causes a lot of troubles using ZEMAX. Can anybody explain this to me ?

Chief raylocations

If the system is paraxial, the entrance/exit pupils are images of the aperture stop. That means, if a ray goes through the center of the entrance pupil. Then, that same ray will also go through the center of the aperture stop, and the exit pupil.

In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, ...

I tried to figured out the difference between the chief ray definition by the classical books and the convention by ZEMAX.

Chief raylenses

The shortest focal length, or "ultra wide-angle"lenses, range from 14mm to 20mm, and are followed by "wide-angle" lenses from 24mm to 35mm, and then "standard" ...

Chief rayOptics

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The black box from Savvy Optics is a black powder coat, cleanroom compatible viewing fixture which allows inspections in accordance with the MIL-PRF-13830B ...

Chief raytracing

Chief rayand marginalray

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In the first figure that you show from Arizona University, if you loolk at the initial trajectory of the chief ray, it is indeed aiming at the center of the entrance pupil. I’ve tried to highlight this with a blue (dash-dot-dot) arrow in my screenshot below (sorry for colorblind people, its all I could do with the original figure colorcode):

Ray aiming should be turned on by default in 2023. Back in the 90s when Ken first wrote the code, he defaulted it off because users were running on 286, 386 processors and the like. There’s no reason for that now.

Screen Pixels Per Inch. A screen resolution of 1920x1200 means 1,920 pixels horizontally across each of 1,200 lines, which run vertically from top to bottom.

LaserPoint manufactures laser power and energy meters for laser measurements up to multi-kilowatts, repetition rate up to MHz, pulse duration of ...

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