Cooke triplet
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 elimination of most of the optical distortion or aberration at the outer edge of the image.
| Introduced in | 1893 |
|---|---|
| Author | Dennis Taylor |
| Construction | 3 elements in 3 groups |
| Aperture | f/3.5 (early) f/2.8 (rare-earth optical glass) |
The Cooke triplet is noted for being able to correct the five Seidel aberrations. The compound lens design consists of three air-spaced simple lens elements: two biconvex (positive) lenses surrounding a biconcave (negative) lens in the middle. It is one of the most important objective designs in the history of photography.
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