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UltravioletPhotography

Eremophila nivea [Silky Eremophila]


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Sizgek, E. (2018) Eremophila nivea Chinnock (Scrophulariaceae) Silky Eremophila. Flowers photographed in ultraviolet and visible light. UV-induced visible fluorescence photograph included. http://www.ultraviol...lky-eremophila/

 

Illawong, New South Wales, Australia

7 February 2018

Australian Native Wildflower. This particular plant was cultivated by Menai Wildflower Group (Lloyd Hedges) from cuttings.

 

Comment: Eremophila nivea is endemic to arid areas of South Western Australia on sandy clay and clay loam. It is listed as endangered facing a high risk of extinction in the wild in the short term. It has very hairy stems and foliage giving the plant a very distinctive silvery appearance. Eremophila is a large genus of 214 species which are all endemic to Australia.

 

References:

1. Five endangered new species of Myoporaceae from south-western Australia Chinnock, R.J., Nuytsia 5 (3): 391–400 (1986) https://florabase.dp...search?volume=5

2. Chinnock, R.J. (Bob) (2007). Eremophila and allied genera : a monograph of the plant family Myoporaceae (1st ed.). Dural, NSW: Rosenberg. ISBN 9781877058165.

 

Visible Light: Nikon D800, Micro-Nikkor 55mm 1:2.8, f/11 for 1/60" @ ISO 100, Nikon SB5000 flash with 20 X 30cm flash gun diffuser softbox.

post-181-0-91669300-1517965719.jpg

Image Reference: ES8817-4

 

Ultraviolet Light: Nikon D3200 Full spectrum converted, EL-Nikkor 50mm 1:2.8 metal body lens+Baader UV-Pass Filter, Canon 199A modified (bare tube), f/8 for 1/6" @ ISO 800.

post-181-0-62415700-1517965809.jpg

Image Reference: ES1597-1

 

The flower bud seen on upper left of the main stem indicates that the hairy formations on the sepals and stems are UV reflective, while the petals seen in the bud are UV absorbing.

 

Cropped Image ES1597-1

post-181-0-51905400-1517965967.jpg

Image Reference: ES1597-2

 

Images ES1597-1 and ES1597-2 show UV absorbing filaments of the stamens in black colour. Fibrous formations observed at the inner bases of the petals seem to be UV reflecting.

 

UV-Induced Visible Fluorescence: Nikon D800, Micro-Nikkor 55mm 1:2.8, Nichia NVSU233A diode torch with Baader UV-Pass Filter f/8 for 15" @ ISO 100, in total darkness.

post-181-0-70941700-1517966079.jpg

Image Reference: ES8821-2

 

UV-Induced Visible Fluorescence: Nikon D800, Micro-Nikkor 55mm 1:2.8+Baader UV/IR-Cut Filter, Nichia NVSU233A diode torch with Baader UV-Pass Filter f/8 for 15" @ ISO 100, in total darkness.

post-181-0-73701800-1517966143.jpg

Image Reference: ES8830-2

 

Images ES8821-2 and ES8830-2 show that, apart from the slight difference in brightness and saturation, which was originated from image processing, it appears that use of a Baader UV/IR-Cut Filter on the lens does not cause significant difference in the fluorescence images. It should also be noticed that the UV torch was not fixed onto a support but hand held while the photographs were taken. This would introduce difference in the overall illumination.

 

Infrared Light: Nikon D3200 Full spectrum converted, Micro-Nikkor 55mm 1:2.8+Lifepixel Standard Color Infrared (720nm) Filter, bright sun light, f/8 for 1/160" @ ISO 100.

post-181-0-03915400-1517966510.jpg

Image Reference: ES1608-2

 

Infrared Light: Nikon D800, Micro-Nikkor 55mm 1:2.8+Lifepixel Standard Color Infrared (720nm) Filter, bright sun light, f/8 for 6" @ ISO 640.

post-181-0-52829700-1517966577.jpg

Image Reference: ES8835-2

 

Image ES8835-2 was taken using an unconverted camera for experimental purpose.

 

Published 7 February 2018

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