{"id":55,"date":"2026-07-11T19:33:53","date_gmt":"2026-07-11T19:33:53","guid":{"rendered":"https:\/\/bokehsommelier.com\/index.php\/glossary\/petzval\/"},"modified":"2026-07-11T19:33:53","modified_gmt":"2026-07-11T19:33:53","slug":"petzval","status":"publish","type":"bso_glossary","link":"https:\/\/bokehsommelier.com\/index.php\/glossary\/petzval\/","title":{"rendered":"Petzval"},"content":{"rendered":"<p>The Petzval objective, calculated by Joseph Petzval in Vienna in 1840, was the first photographic lens designed mathematically rather than by trial and error. 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