It's a bird

by Vian Esterhuizen

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Smaller format lenses are eased by having lower maximum image heights and smaller fields of view at the same focal length. Each aberration has explicit field dependencies which describe the rate at which they grow. For the following equations, y is the ray height at the lens and h is image height. Spherical Aberration varies by y3. Coma varies by y2h. ...

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