Commons:Valued image candidates/Yellowing of thorium lenses.jpg
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Yellowing of thorium lenses.jpg
| Image |  |
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| Nominated by | El Grafo (talk) on 2015-01-13 17:21 (UTC) |
| Scope | Nominated as the most valued image on Commons within the scope: Yellowing of Takumar lenses |
| Used in | Global usage |
| Reason | “Yellowing” (see file description) is a common problem with old lenses, probably most prominently among Asahi's Takumars. I had the somewhat rare chance to compare two identical lenses with the only difference being that one was “de-yellowed” using UV-light. There is of course a bit of "original research" involved, but though there is probably no real scientific research available on this topic, both the phenomenon and its "cure" are well-known among photographers familiar with older equipment. -- El Grafo (talk) |
| Review (criteria) |
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