Lot 9
Owner: Auction
Phosphorographs
Phosphorographs
Color photos of phosphorescent minerals, taken in darkness with a strobe flash that fires just before the camera shutter opens.
Just as our eyes cause colors to pale in moonlight, weak phosphorescence is often perceived as grayish when the colors may actually be very rich. This is due to our more sensitive scotopic vision rod cells being of only variety and thus monochrome, while our daytime photopic cone cells can sense red, green, and blue.
These images are at the noise limit of a typical DSLR camera, but illumination was from a consumer flash with only about 50 watt-seconds of power. Using multiple 500w studio strobes would provide enough excitation to have more uniform illumination and minimize the noise with shorter exposure times.
The bluish longwave images were taken just for reference during this experiment. They lack proper filtering of the cheap blacklight-blue bulbs, or any cutoff filter over the lens. Next time around, the colors will be more accurate.
IMG_0196-franklin-flash-800.JPG
Franklin Mineral Phosphorescence - long
This phosphorescence after white light flash excitation
Franklin Mineral Phosphorescence - Short
Compare this to the longer exposure version.
IMG_0203-hackmanite-flash-800.JPG
IMG_0206-hackmanite-phos-dpp-800.JPG
IMG_0213-terlingua-flash-800.jpg
IMG_0215-terlingua-swfl-dpp-800.JPG
IMG_0216-terlingua-phos-dpp-800.JPG
IMG_0217-marine-swfl-800.JPG
IMG_0218-marine-flash-800.JPG
IMG_0225-marine-phos-dpp-800.JPG
IMG_0227-manganocalcite-swfl-800.jpg
IMG_0229-manganocalcite-whitelight-800.jpg
IMG_0230-manganocalcite-phos-800.jpg
IMG_0252-castledome-sw-800.JPG
IMG_0253-castledome-white-800.JPG
IMG_0262-castledome-phos-dpp-800.JPG
IMG_0273-dpp-bone-phos-800.jpg
IMG_0274-bone-sw-fluor-dpp-800.JPG
IMG_0275-dogtooth-calcite-swfl-dpp-800.JPG
IMG_0277-dogtooth-calcite-white-800.JPG
IMG_0280-dogtooth-calcite-phos-800.JPG
IMG_0282-barite-swfl-dpp-800.JPG
IMG_0283-barite-white-800.JPG
IMG_0287-barite-rose-phos-dpp-800.JPG
IMG_0298-amber-white-800.JPG
IMG_0300-amber-swfl-dpp-800.JPG
IMG_0302-amber-phos-dpp-800.JPG
IMG_0309-teeth-phos-crop-640.jpg
Phosphorescent Teeth
IMG_0318-greenland-sodalite1-swfl-800.JPG
IMG_0319-greenland-sodalite1-lwfl-800.JPG
IMG_0321-greenland-sodalite1-flash-800.JPG
IMG_0324-greenland-sodalite1-phos-800.JPG
IMG_0344-fluorite-sphere-flash-800.JPG
IMG_0346-fluorite-sphere-lwfl-800.JPG
IMG_0347-fluorite-sphere-swfl-800.JPG
IMG_0348-fluorite-sphere-phos-800.JPG
IMG_0351-fluorite2-phos-dpp-800.JPG
IMG_0354-fluorite2-flash-800.JPG
IMG_0355-fluorite2-swfl-dpp-800.JPG
IMG_0357-fluorite2-lwfl-dpp-800.JPG
IMG_0358-greenland-sodalite2-lwfl-dpp-800.JPG
IMG_0359-greenland-sodalite2-swfl-dpp-800.JPG
IMG_0360-greenland-sodalite2-flash-dpp-800.JPG
IMG_0362-greenland-sodalite2-phos-dpp-800.JPG
IMG_0364-greenland-sodalite2-mwfl-dpp-800.JPG
IMG_0365-GoblinValleyUtah-white-dpp-800.JPG
IMG_0367-GoblinValleyUtah-blb-dpp-800.JPG
IMG_0368-GoblinValleyUtah-swfl-dpp-800.JPG
IMG_0369-GoblinValleyUtah-phosphorescence-dpp-800.JPG
IMG_0374-pinecrest-flash-dpp-800.JPG
IMG_0375-pinecrest-lwfl-dpp-800.JPG
IMG_0376-pinecrest-swfl-dpp-800.JPG
IMG_0380-pinecrest-phos-dpp-800.JPG
IMG_0381-septarian-flash-800.JPG
IMG_0383-septarian-swfl-800.JPG
Septarian nodule LW
Septarinan Nidule, Orderville, UT under longwave UV
Septarian nodule phosphorescence
Specimen is a gift from Wiley Berry, Tetla Septarians, Orderville, UT
IMG_0625-phosphorography-setup-600.jpg
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