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| 06-09-2008, 06:45 PM | #16 |
| Hmmm...heat, not light?  Originally posted by KungPOW  mmmmm.....Thorium.... Here is a link that explains the whole clear to yellow to clear again thing fairly well. Activation of color centers in Glass Who needs a science dregree now that we have google? Oh, well, I'll still have the tomatoes. germar | |
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« Good Old 28mm
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what 135mm?? »
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| couple, elements, glass, k-mount, pentax lens, slr lens, sunlight, weeks |
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