Author Topic: Fluorescent Dragonflies (Anisoptera)  (Read 2242 times)

Øivind Tøien

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Fluorescent Dragonflies (Anisoptera)
« on: July 03, 2017, 09:11:07 »
On the day I received the ZWB1 filter for my Tank 007 TK-566 UV torch I found two half dead dragonflies in the road on my way to work...
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On casual inspection they looked intact, would flap their wings when stimulated, but without trying to get away. I often see dead dragonflies and juvenile dead (flat) squirrels at this location. I had a little bouquet of flowers set up in the lab for something for them to hold on to. They remained still for long periods except when initially stimulated by the UV light, but not all frames were completely sharp. The light source in the visual light frames is the overhead fluorescent tubes of the lab. I used a Nikon L39 filter on the lens. (Most of these also posted in the Ultraviolet Photography forum).

UV-induced visual fluorescence (UVIVF).
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105mm f/4 AIS Micro Nikkor @ f/8 on unmodified D7100, 8sec, ISO 100


UVIVF - a closer look.
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105mm f/4 AIS Micro Nikkor @ f/8 on unmodified D7100, 20s, ISO 100


UVIVF - Crashed and down.
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105mm f/4 AIS Micro Nikkor + PN-11 @ f/8 on unmodified D7100, 8s, ISO 100.


UVIVF -  forensic frontal shot (the black bench top shows blue fluorescence).
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105mm f/4 AIS Micro Nikkor +PN11 @ f/8 on unmodified D7100, 25s, ISO 100.


UVIVF -  forensic side shot. The stripes on the side of the body identifies it is an Aeshna eremita (Lake Darner) according to our entomologist at  the museum.
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105mm f/4 AIS Micro Nikkor +PN11 @ f/8 on unmodified D7100, 20s, ISO 100.


In room light with bottom side of a fern:
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105mm f/4 AIS Micro Nikkor @ f/8 on unmodified D7100, 1s, ISO 100.


UVIVF parting shot
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105mm f/4 AIS Micro Nikkor @ f/8 on unmodified D7100, two frames with different lighting angle averaged, each 15s, ISO 100.


--  Next day they were both dead. RIP dragonflies.


(I thought I posted this last week, but the tab must have been accidentally closed while waiting for the very slow preview to appear).
Øivind Tøien

Erik Lund

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Re: Fluorescent Dragonflies (Anisoptera)
« Reply #1 on: July 03, 2017, 12:28:02 »
Beautiful creatures! Well captured ;)
Erik Lund

armando_m

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Re: Fluorescent Dragonflies (Anisoptera)
« Reply #2 on: July 03, 2017, 15:26:20 »
Beautiful images, thanks for sharing them

the colors under UV are amazing
Armando Morales
D800, Nikon 1 V1, Fuji X-T3

Bill Mellen

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Re: Fluorescent Dragonflies (Anisoptera)
« Reply #3 on: July 03, 2017, 18:06:31 »
Absolutely beautiful images!

Thank you for sharing them.

I do not always like the way that UV and IR images look, these are very nice.
Everything gets better as we grow younger and thinner

Fons Baerken

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Re: Fluorescent Dragonflies (Anisoptera)
« Reply #4 on: July 03, 2017, 20:37:26 »
Awesome!

Øivind Tøien

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Re: Fluorescent Dragonflies (Anisoptera)
« Reply #5 on: July 03, 2017, 22:18:19 »

Thanks or the enthusiastic comments all of you! This is quite new to me and the foreign colorful world of UV-induced visual fluorescence gives me associations to a strobe lit underwater scene (I am an old underwater photographer).

For those inspired, the logistics is pretty simple: No conversion of the camera body needed, any macro  capable body that can be kept steady (tripod mounted etc.) and expose in the range of 1-30 seconds will do, a UV flashlight + UV safety glasses can be had for $50 or so, the UV-high pass filter on the UV-LED flashlight was $11 shipped. Then a dark place is needed for us living at high latitude in summer, so the photography becomes a studio scene. The good thing is that one are then are out of harm of the mosquitoes that can limit the pleasure and calm needed to do tripod mounted macro-photography outdoors during their active season here in Alaska.  :)
Øivind Tøien