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200 Korún Jozef Maximilian Petzval
| Issuer | National Bank of Slovakia |
|---|---|
| Year | 2007 |
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| Orientation | Medal alignment ↑↑ |
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|---|---|
| Obverse script | Latin |
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| Reverse lettering | JOZEF MAXIMILIÁN PETZVAL 1807 - 1891 |
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| Additional information |
Petzval developed his namesake lens formula in 1840, calculated entirely by hand with the help of artillery soldiers recruited for their arithmetic ability — the computation alone took months. His portrait lens reduced required exposure times by a factor of roughly 20, making practical photography of human subjects possible for the first time. Despite this, he died in poverty and relative bitterness, having spent his later decades in a largely unsuccessful dispute over credit for inventions he felt had been stolen.
Slovakia claims him through his birthplace of Spišská Belá, though Petzval spent virtually his entire career in Vienna.