Andrea B. Posted April 29, 2018 Share Posted April 29, 2018 ChalcedonyThis rude rock is sticking its tongue out at us, but it fluoresces so prettily in blue tones that I ignore its lack of manners. D200-mod + Noflexar 35/3.5 UV-induced visible fluorescence with 365 UV-Led, unfiltered.Baader UV/IR-Cut filter on lens.f/8 for 2" @ ISO-400 in the dark.Lint shows up faithfully to appear in fluorescence photographs because it is under the mistaken impression that it is needed for indicating depth of field when photographing in the dark. As it has no other use in the world, I haven't wanted to make it sad by taking its job away. UV with 365 UV-Led, unfiltered.BaaderU UV-pass filter on lens.f/8 for 1/3" @ ISO-400 in the dark.Fairly bright in UV. Visible with on-board flash.Baader UV/IR-Cut on lens.f/8 for 1/45" in the dark.Under the flash, the result is a bit too vivid. I should perhaps pull back the saturation. Link to comment
Hornblende Posted April 30, 2018 Share Posted April 30, 2018 Very nice, the fluorescence must be due to chemical impurities in the chalcedony. Link to comment
Andrea B. Posted April 30, 2018 Author Share Posted April 30, 2018 I wish I knew more about some of my mineral samples. The newer ones I bought specifically because they are fluorescent arrive with origin information such as country or mine. But the older ones were just purchased in a "tourist" shop and you don't get anything more than a name. I recently realized that the name can be inaccurate sometimes. My bloodstone is really not a bloodstone, for example. Link to comment
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