Cooke triplet

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What Wikipedia says

The Cooke triplet is a photographic lens designed and patented in 1893 by Dennis Taylor who was employed as chief engineer by T. Cooke & Sons of York. It was the first lens system that allowed the elimination of most of the optical distortion or aberration at the outer edge of the image.

Excerpt from the Wikipedia article “Cooke triplet”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tamasflex, CC BY-SA 3.0, via Wikimedia Commons.