JMC Posted May 22, 2019 Share Posted May 22, 2019 Crowther, J. (2019) Clematis L. cf. 'Lincoln Star' (Ranunculaceae) Clematis. Flowers photographed in ultraviolet and visible light.https://www.ultravio...-star-clematis/ Egham, Surrey, UK9 to 9:30AM, 23 May 2019Cultivar in private garden Comment:I am not 100% certain that this is 'Lincoln Star', however the appearance is a close match to images found online. Reference:(1) Clematis on the Web (accessed June 2019) Lincoln Star Equipment Visible [Canon EOS 5DSR + 28-105mm EF lens] Equipment UV [Nikon D610-ACS UV conversion + Asahi 85mm f4.5 Ultra-Achromatic-Takumar with M42-Nikon lensless adapter] Visible Light [lens set to 90mm, f/10 for 1/200s @ ISO 500 in daylight (partial shade), captured as JPEG in camera with auto whitebalance].Image resized to 1000 pixels maximum size Ultraviolet Light [f/22 for 20s @ ISO 800 in daylight (overcast and in the shade), whitebalanced in Darktable using PTFE disk]Images resized to 1000 pixels maximum size Complete flower Center of flower (cropped from original image before resizing) Link to comment
DaveO Posted May 24, 2019 Share Posted May 24, 2019 G'day, I see this UV-blue quite a bit in some of my UV images of Australian native flowers so it is quite widespread. You can probably guess where this is going from a retired chemist suffering lab-withdrawal symptoms. It would be nice to see the UV-Vis reflectance spectra of the petals and also of the black stamens etc in the centre. Here's a very interesting paper which shows such spectra how to colour a flowerhttp://rspb.royalsocietypublishing.org/content/283/1830/20160429 Dave Link to comment
Andrea B. Posted June 25, 2019 Share Posted June 25, 2019 Thanks for the contribution, Jonathan. Dave, I'm enjoying this paper. Good info. Thanks for the link. Link to comment
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