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Physarum Polycephalum in Ultraviolet
UV picture of Physarum. Note that this is not a fluorescence image, but rather a picture taken through a UV pass filter. Not entirely surprising, but the slime mold shows strong absorption in UV. LOV-domain proteins and Cryptochrome photoreceptors allow Physarum to sense blue and UV light. (those are the ones that I know anyway)
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Comment by Nemo Andrea on October 19, 2019 at 12:53
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@ian (Don't see a reply option) yeah the camera needs to be modified for this (IR can in principle be done without but it means you are restricted to 30s exposure time for IR, which is no fun). Conversion is a matter of removing the internal dust shaker filter (if present) and the hot mirror (filters UV and IR out) in front of the sensor. I removed it myself in my case in this old canon camera. You can also get it done professionally for about 300 euros.
IR is nice because there are a lot of wavelength options, and there is a lot of it. UV is more tricky as filters are a bit more expensive and there is very little of it, so you need higher exposure times and be very well aware of the lenses you use. On ultravioletphotography.com there are good lists of what lenses work well or acceptably well.
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Comment by ian on October 18, 2019 at 8:56
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Oooooooh I love that. Does the camera have to be modified? I know for true IR you need a filter removing 'cos I ruined a camera on a DIY attempt..
I love the way it makes the contrast between slime and trails so much clearer
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If you are interested in taking pictures in ultraviolet, I can recommend ultravioletphotography.com. There are some good resources there for what gear one needs and relevant discussions.
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