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Mineral PhotographyExposure problems caused my fluorescence?
30th Jul 2017 15:59 UTCLarry Eicher
Occasionally I come across samples which present exposure nightmares. I am currently working on gypsum which is posing this problem
There are, perhaps two crystals in the upper right which are causing the problem. I exposed this one at ec -3. I used one Neewer led light on low setting. The light had a diffuser mounted. The light also had to go through a white plastic tubular diffuser/reflector. I held almost all detail in the "two" crystals. I pushed up "fill" light and "brightness" to help compensate for the under exposure. Could this "hot" spot be caused by UV light? I don't see how since I can't see UV light, but I am at a loss.
Regards,
Larry
30th Jul 2017 21:21 UTCDoug Daniels
31st Jul 2017 16:42 UTCLarry Eicher
7th Nov 2017 18:09 UTCLarry Eicher
Thanks for your reply and apologies for my tardy reply. I have since come to the same conclusion. I was just beginning to consider UV light at the time I asked. I have learned enough to know that I needn't worry about UV light until my camera is modified so as to capture light in that range.
I have since modified my setup adding the option to rotate the subject until the faces are aligned such that we get no blown out highlights. I don't yet have an image of the "new" setup but if you are interested, I will create one and post it.
Regards,
Larry
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 25, 2024 02:16:45