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Hoya carnosa [Wax Plant]


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#1 msubees

    Zach Huang

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Posted 17 July 2014 - 00:43

Huang, Z.Y. (2014) Hoya carnosa Thunb (Apocynaceae) Wax Plant. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...nosa/#entry3643

Okemos, Michigan, USA
15 July, 2014
Cultivar in home garden

Comment:
Photographs taken in the back porch of our house. The plant was grown inside a pot.

Reference:
http://en.wikipedia....nicera_japonica


Equipment
Camera: Panasonic Lumix DMC-G5-broadband + El Nikkor 80mm f/4.5].

Visible Light [ ISO160, S8612 (1.75 mm thick), Canon Speedlite 199A with front cover removed]

1. Single flower, shutter speed: 1/60 sec, F/48, flash on hotshoe

Attached Image: P1110371-Hoya-VIS.jpg

2. Inflorescence, shutter speed: 1/60 sec, F/48, flash on hotshoe

Attached Image: P1110358-Hoya-VIS.jpg

Ultraviolet [f/8, S8612 (1.75mm thick) + UG11 (1 mm thick), Canon Speedlite 199A with front cover removed]

3. Single flower, 1/60 sec, F/8, flash on hotshoe

Attached Image: P1110372-Hoya-UV.jpg

4. Inflorescence, F/8, exposure 1 sec, with flash fired by hand (3x closer to flower than hotshoe)

Attached Image: P1110359-Hoya-UV.jpg

Edited by Andrea B., 15 March 2015 - 17:25.


#2 nfoto

    Fierce Bear of the North

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Posted 17 July 2014 - 07:49

These are very nice. I have obtained the same UV signature from material cultivated in my country. H. carnosa also exhibits a pretty UVIFL. Try that if you not already have tested it.
Bjørn Birna Rørslett

#3 msubees

    Zach Huang

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Posted 17 July 2014 - 12:25

Bjorn,

Thank you! you have almost all the flowers!

i need to buy a UV torch..I might try the mineral light tonight but it has some visible light (i broke the dark glass which blocks the visual).

Andrea, do you have a link to buy the same type of yours? there are so many brands I am not sure which one is the right one.

Edited July 19, 2014: I used the mineral light last night and saw this...some hint of UV induced visible fluorescence?

Posted Image

Edited by msubees, 19 July 2014 - 17:10.
Corrected the image link for you so the image would display


#4 msubees

    Zach Huang

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Posted 19 July 2014 - 20:08

Bjorn,

please check the above photo to see if it is UV induced fluorescence.

#5 nfoto

    Fierce Bear of the North

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Posted 19 July 2014 - 20:56

Hard to say. I'm not sure there is much UV to induce fluorescence in the first place?

My UVIFL image of H. carnosa looks like this,

Attached Image: HOYA_CAR_I0803196863_UVIFL.jpg

Nichia 365 nm UV LED torch. ISO 200, 15 sec. f/11, D200, Kodak 2E filter.
Bjørn Birna Rørslett

#6 msubees

    Zach Huang

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Posted 19 July 2014 - 21:03

hmmm, quite different...I used only 3 seconds...perhaps there were too much visual light in my photo. and these were just reflections? I need a torch....

#7 Andrea B.

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Posted 20 July 2014 - 14:55

Zach, my Nichia 365 UV-Led torch was made by Don McLeish and is called the Titanium Haiku. It cost approximately $500 a few years back. I think the Nichia chips have been improved since then.

Don uses the screen name McGizmo and hangs out on the CandlePower Forums: http://www.candlepow...om/vb/forum.php
You will probably have to search out his email address on that site and write him about what he is making these days.
Andrea G. Blum
Often found hanging out with flowers & bees.

#8 nfoto

    Fierce Bear of the North

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Posted 20 July 2014 - 16:35

A powerful UV LED torch is one of the many (indispensable) tools for a UV photographer. Do remember always to put on your UV-protective goggles before such a torch is used.

Evaluting UV-induced fluorescence is a major field of application of course. However, the torch can also be used for a quick assessment of the suitability of a lens for UV photography: shine the UV torch into the lens and look for signs of a haze inside. This usually appears brownish and if present, is a clear sign that the lens will block UV.
Bjørn Birna Rørslett

#9 msubees

    Zach Huang

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Posted 21 July 2014 - 17:07

Thanks, Andrea and Bjorn.

$500! that is a big investment....

Zach

#10 Alex H

    Oleksandr Holovachov

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Posted 21 July 2014 - 18:42

Recent prices in Europe for 3W Nichia torches (365nm) have gone down in recent years.

#11 msubees

    Zach Huang

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Posted 23 July 2014 - 16:34

I have seen on the web some 5 and 10 w ones, just the bulb though, and one has to have a torch to house them.

#12 Alex H

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Posted 24 July 2014 - 16:53

I am referring to 3-5W Nichia LED's instaled in torches. I have three of those.

#13 msubees

    Zach Huang

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Posted 24 July 2014 - 17:04

Alex,

can you share some links where you bought them? I should try to get one and test. Thanks.

Zach

#14 Alex H

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Posted 24 July 2014 - 19:52

I am again not getting email notifications from UVP. Something is not right.

Zach, eBay item 111019138285, for example.

#15 nfoto

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Posted 24 July 2014 - 21:14

Alex: I have observed the same issue with notifications after the migration to a new server for UVP. We are investigating the cause.
Bjørn Birna Rørslett

#16 msubees

    Zach Huang

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Posted 04 August 2014 - 18:52

Alex,

thank you!

Zach

View PostAlex H, on 24 July 2014 - 19:52, said:

I am again not getting email notifications from UVP. Something is not right.

Zach, eBay item 111019138285, for example.