# Tessar

> Front element, air-spaced flint, a stop, then a cemented rear pair — the classic Tessar.

![Tessar](https://www.loomrume.com/optics/stills/tessar.png)

**Paul Rudolph** · 1902, Jena — Zeiss Tessar

Tessares is Greek for four: front crown, air-spaced flint, stop, cemented rear doublet. Rudolph filed it in 1902 after the [Planar](https://www.loomrume.com/examples/planar.md). Zeiss advertised it as “the eagle eye of your camera”. It stayed in production, in one shape or another, for most of the twentieth century.

It looks like a [Cooke triplet](https://www.loomrume.com/examples/cooke-triplet.md) with the rear glass split and glued. Rudolph actually came from his own Protar, not from Taylor. This board is the four-glass recipe on a meter.

## Sources

- [Tessar](https://en.wikipedia.org/wiki/Tessar)
- [Paul Rudolph](https://en.wikipedia.org/wiki/Paul_Rudolph_(physicist))

## Links

- [HTML](https://www.loomrume.com/examples/tessar)
- [Open in Studio](https://www.loomrume.com/experiments/new?template=tessar)
- [llms.txt](https://www.loomrume.com/llms.txt)