• Ultraviolet Photography

Passiflora caerulea [Blue Passion Flower]

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#1 Adrian


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Posted 04 July 2018 - 10:01

Davies, A. (2018) Passiflora caerulea L. (Passifloraceae) Blue Passion Flower. Flower photographed in ultraviolet and visible light. Visible fluorescent photo also. http://www.ultraviol...passion-flower/

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Comment: I have long wanted to photograph a Passion Flower (Passiflora caerulea) in UVR and UVF. One finally bloomed in the garden yesterday (in the current UK heatwave!) Not sure about the results - need to understand more about the flower structure! The UVR show a UV pattern on alternate petals - interesting!

UVR: Nikon D300 full spectrum conversion, El Nikkor 80mm lens, Baader U, 2 x Metz 45 CT flash guns with plastic UV absorbing window removed. f/11. 400 ISO.
Left: Visible reflected light. Right: Ultraviolet reflected light.
Attached Image: passion flr comp UVR lo res.jpg

UVF: Nikon D800 with 200mm Micro Nikkor. UV source: Convoy S2+, light "painted". Exposure approx. 20 seconds @ f/11.
Left: Visible reflected light. Right: Ultraviolet-induced visible emitted light.
Attached Image: UVF Passion Flr comp lo res.jpg
Adrian Davies

#2 Andy Perrin


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Posted 04 July 2018 - 15:23

Beautiful and interesting how the UVR brought out a difference between the outer ten petals - they seem to be two separate groups of five petals each.

Edited by Andy Perrin, 04 July 2018 - 15:25.

#3 Cadmium


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Posted 05 July 2018 - 03:54

Adrian, These are very nice and sharp, and quite attractive.

#4 Andrea B.

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Posted 06 July 2018 - 14:02

What an interesting flower in UV! That is a remarkable UV-signature. Very nice to see this.

When I lived in Arizona the house had a feature called an "atrium" - a little box of an area in the middle of the house open to the sky. I grew Passion Flower vines on the walls along with a bit of bamboo and some Mugo pines. It was so pretty and the Passion Flowers were so intriguing.

I'm not entirely sure what is fluorescing on the bloom though? Does the whole flower fluoresce? It looks like only the anthers and pollen are really fluorescent? Are the petals fluorescent or simply reflecting other light? What is brightest on the flower under a 10 second exposure?

Adrian, to be in this section the topic must be indexable by title and post header, so I'm going to add that. (Sending PM also.)
Andrea G. Blum
Often found hanging out with flowers & bees.