![File:Lens Petval 1841.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Lens_Petval_1841.jpg/597px-Lens_Petval_1841.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:47, 13 December 2008 | ![]() | 1,056 × 1,060 (325 KB) | Velela | {{Information |Description={{en|1=A portrait lens design by Petval of Austria in 1841, one of the earliest 2 element lens design for photography}} |Source=E.J.Wall, Dixtionary of Photography, Published 1890 |Author=E. J. Wall scanned by Velela |Date=1890, |
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