DaveO Posted March 20, 2020 Share Posted March 20, 2020 Welcome to my gallery. It is my delight, especially in our Spring in Australia, to wander through our bush and photograph our Australian native wildflowers, especially terrestrial orchids. Last year I had an exhibition at a small local gallery in Central Victoria entitled In a Different Light with my photographs of our Australian native wildflowers in UV. This was the image I chose for publicity for the exhibition. Diuris chryseopsis Golden Moths Orchid Link to comment
colinbm Posted March 20, 2020 Share Posted March 20, 2020 Congratulations Dave you are doing great works. Link to comment
DaveO Posted March 20, 2020 Author Share Posted March 20, 2020 Thanks Col, I still get a kick out of seeing stuff that nobody else has ever seen, because we live on the other side of the world. Cheers, Dave Link to comment
nfoto Posted March 20, 2020 Share Posted March 20, 2020 --- I still get a kick out of seeing stuff that nobody else has ever seen, because we live on the other side of the world. --- That is the enchantment of dealing with the "invisible". We are all pioneers and able to explore a new world. A very nice picture, by the way Link to comment
Andrea B. Posted March 20, 2020 Share Posted March 20, 2020 Yes, I love this unusual yellow orchid. (See comment in botanical section.) ** Last year I had an exhibition at a small local gallery in Central Victoria entitled In a Different Light with my photographs of our Australian native wildflowers in UV. Congratulations on having a gallery exhibition, Dave. Did it take a lot of work to prepare for it? Did you print your photos yourself or send them to a commercial printer? Link to comment
Andy Perrin Posted March 20, 2020 Share Posted March 20, 2020 I think this is a great capture and I see why you chose it for your exhibition. Has it ever been established why so many visible-yellow flowers have UV bullseye patterns? Link to comment
DaveO Posted March 21, 2020 Author Share Posted March 21, 2020 Here's how my exhibition appeared in the local paper : Link to comment
Stefano Posted March 21, 2020 Share Posted March 21, 2020 I think this is a great capture and I see why you chose it for your exhibition. Has it ever been established why so many visible-yellow flowers have UV bullseye patterns?I find even more interesting that visible-yellow flowers are very often UV-yellow (sometimes UV-black). For example, why (to my knowledge) there aren't any visible-yellow, UV-blue flowers? Link to comment
Andy Perrin Posted March 21, 2020 Share Posted March 21, 2020 Stefano, that's almost certainly a coincidence of the choice of Bayer dyes and how they behave in UV. It's not a property of the external world, it's determined by our camera's construction. (If you prefer BGR photos like OlDoinyo does, then they are not yellow.) Link to comment
Stefano Posted March 21, 2020 Share Posted March 21, 2020 [a bit off-topic] I found this discussion about UV-yellow: https://www.ultravioletphotography.com/content/index.php/topic/3082-is-an-assignment-of-colors-to-uv-wavelengths-possible/page__view__findpost__p__25099__hl__%2Buv+%2Bmatlab__fromsearch__1 Referring to the last post, I have a yellow sweatshirt (or something similar) that is also UV-yellow. Link to comment
Stefano Posted March 21, 2020 Share Posted March 21, 2020 Stefano, that's almost certainly a coincidence of the choice of Bayer dyes and how they behave in UV. It's not a property of the external world, it's determined by our camera's construction. (If you prefer BGR photos like OlDoinyo does, then they are not yellow.)True, it is a coincidence, but colors (even in UV) have a meaning. Most yellow flowers reflect [infrared], red, green (hence the yellow color), absorb blue (and violet), absorb longwave UV (~380-400 nm) and have a bump around 360 nm, which gives them their UV-yellow color. I find this interesting. Link to comment
Andrea B. Posted March 25, 2020 Share Posted March 25, 2020 Dave, thanks for posting the write up in the local newspaper. I'm always so happy to see one of our members enjoy their photographic success! Keep up the good work. Stefano, you might want to read up on the pigments which give flowers their color. See also https://www.ultravio...-chittka-paper/ I once started making a chart of our posted flowers which showed their colour together with their false colour. Link to comment
DaveO Posted March 25, 2020 Author Share Posted March 25, 2020 This is a link to a paper with spectra of flower petals - if onlyhow to colour a flowerhttp://rspb.royalsocietypublishing.org/content/283/1830/20160429 Link to comment
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