Anamorphic Astigmatism & Coma!
- Miguel Torija
- Jul 26, 2024
- 1 min read
Updated: Jun 10
Anamorphic lenses are becoming more common every day in all kinds of shows, and with them come various lens aberrations, each one beautiful in its own way, but sometimes difficult to match.
Among these aberrations are Astigmatism and Coma. Astigmatism produces a blurry effect around the edges of the image due to the offset of light rays "arriving" at different focal planes. A similar phenomenon occurs with the Coma effect, but visually, they are quite different. Here are some examples of both effects:
Refs. Not the actual tool.
Image sources: A practical Guide to Lens Aberrations || Astronomical Optics: Aberrations || Aberrations in optical systems And to help you replicate those effects in a quick and easy way, I've created two tools (well, actually three): Anamorphic-Astigmatism, and Coma. We have been using them in production with lovely results:
Dots pattern for testing inspired by Chris Fryer Cats Eyes Defocus setup
There are two versions of Anamorphic-Astigmatism: the regular one and the Ch (chroma or chromatic) version, which allows you to distort each channel independently.
Compatible with nuke 12.1 and later.
Download them here:
Coma:
Anamorphic Astigmatism:
Anamorphic Astigmatism Chroma:
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