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The bad mandarin in the basket etc.

Fluorescence
20 replies to this topic

#1 Øivind Tøien

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Posted 13 December 2020 - 13:01

After picking a basket of mandarins up in the store there is some enrichment in finding that single one that hid out of sight and starts turning into mush after only a few days.
All D500 and 55mm f/3.5 AI @ f/11 with a Nikon L39 UV filter to dampen lens fluorescence, UVIVF 1-8s exposures dual lighting with Convoy S2+ 365nm and Tank 007, both with what is likely ZBW2 filters on the front, daylight WB and warmed to 8000-1000K in CNX-D in post to dampen the blue cast.

Visual spectrum:
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UVIVF
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Looking carefully there seems to be some small critters living in it, with entrance holes to the right. (I could have needed more depth of field in this one).


Inspired by microbat52's excellent Lemon I had to try one of the good mandarins, first visual light:
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interestingly in UVIVF the mandarin looks more like a lemon or grapefruit, while microbat52's lemon looked more like a blood orange!
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I did some more searching for other interesting colors in the kitchen and found some dried (sweetened) cranberries. Visual light:
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UVIVF:
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Interesting how the surface turns matte.


I added some pecans, their internals are highly fluorescent, as were the other nuts and almonds I tried out, it is hard to not blow them out.
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Edited by Øivind Tøien, 13 December 2020 - 13:03.

Øivind

#2 colinbm

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Posted 13 December 2020 - 13:29

All very lovely examples, thanks.

#3 Bernard Foot

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Posted 13 December 2020 - 15:10

The fluorescing cranberries are amazingly colourful. But then so is the mould on the mandarin. Great photos.
Bernard Foot

#4 Cadmium

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Posted 13 December 2020 - 19:52

Øivind. I really like the dried cranberries! Those are really surprising and interesting! :smile:

Edited by Cadmium, 14 December 2020 - 02:12.


#5 bobfriedman

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Posted 13 December 2020 - 21:02

yummy.

#6 Stefano

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Posted 13 December 2020 - 21:11

The amount of colors is surprising. You have all of them.

#7 microbat52

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Posted 13 December 2020 - 21:16

Thats awesome!

#8 dabateman

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Posted 13 December 2020 - 21:29

I didn't know pecans where that bright. I still need to image the various nuts I have.
Great series of images.

#9 Øivind Tøien

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Posted 13 December 2020 - 23:17

Thanks for the kind comment all of you.

Yes, the cranberries were really interesting - while the interior seems mostly consistently blue, the surface color variation does not seem to reflect much in their visual appearance. Could it be different degree of ripening before harvesting or perhaps degree of light exposure during that process? I guess I will have to go out and check the fresh ones next summer and perhaps check out another brand of the dried ones from the store.

The pecans were quite a dynamic range challenge. The unbroken surface looked darker than in the images, as I had to lift the darks for the colors on the cranberries.
Øivind

#10 colinbm

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Posted 14 December 2020 - 03:16

View Postdabateman, on 13 December 2020 - 21:29, said:

I didn't know pecans where that bright. I still need to image the various nuts I have.
Great series of images.

We really don't need to see your nuts Dave.... :omy:

#11 Andy Perrin

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Posted 14 December 2020 - 06:01

View Postcolinbm, on 14 December 2020 - 03:16, said:

We really don't need to see your nuts Dave.... :omy:
At this point it's the only thing we haven't shown on the forum. :grin:

Edited by Andy Perrin, 14 December 2020 - 06:01.


#12 Andrea B.

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Posted 16 December 2020 - 02:55

Cool fluor, Øivind. Nice work.

It's funny how we start hoping one of the fruits in a gift box is slightly spoiled. We got
a lovely box of apples, pears and oranges just the other day. And sure enough, a quick
search with the UV-LED torch found the one which was on the verge of producing mold.
I put it aside to do this on its own and not spread to the other fruits. "-)
Andrea G. Blum
Often found hanging out with flowers & bees.

#13 Øivind Tøien

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Posted 16 December 2020 - 09:20

Thanks Andrea. Yes I was also lucky I found the one above after only a few days without any ill effects to the others so far.

I had to try UVIIRF today on one of the remaining good ones (we used to call it UVIIF for a while, but I have seen the former used recently). Captured with my D40x IR-720nm (Lifepixel standard conversion), otherwise same setup as above, with the two UV lights a relatively shallow angle form each side. This time processed in CNX2 instead of CNX-D, no channel swapping.

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Edited by Øivind Tøien, 16 December 2020 - 09:21.

Øivind

#14 Stefano

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Posted 16 December 2020 - 09:25

The "yellow flames" you got are nice. False yellow in standard IR images means short wavelengths, and that makes sense as Bernard noticed higher IR fluorescence is usually very dim.

#15 Øivind Tøien

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Posted 16 December 2020 - 09:29

Thanks Stefano, interesting information - I wondered about those yellow highlights.
Øivind

#16 microbat52

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Posted 16 December 2020 - 12:52

Ooohhhhhhh those yellow highlights look so cool. Weird my lemon showed red highlights. Need to try mandarins now.

#17 Øivind Tøien

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Posted 17 December 2020 - 02:12

Thanks microbat52. It sure would be interesting to compare with other mandarin captures. Do you have an IR capable camera? The yellow highlights only showed up in the UV induced IR fluorescence (UVIIRF), but not in the UVIVF one. Interesting though that the lemon showed somewhat similar, but red highlights in UVIVF. Could your TZ100 be somewhat sensitive to IR?
Øivind

#18 microbat52

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Posted 17 December 2020 - 08:00

View PostØivind Tøien, on 17 December 2020 - 02:12, said:

Thanks microbat52. It sure would be interesting to compare with other mandarin captures. Do you have an IR capable camera? The yellow highlights only showed up in the UV induced IR fluorescence (UVIIRF), but not in the UVIVF one. Interesting though that the lemon showed somewhat similar, but red highlights in UVIVF. Could your TZ100 be somewhat sensitive to IR?

Mmmmmm i did see the red flames with my eyes though.
I do have a IR converted camera, ill also try!

#19 Øivind Tøien

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Posted 18 December 2020 - 07:02

Can be fun. To my joy I found another not quite as bad mandarin today :grin: , I almost ate it :wacko: . Same technique as the previous ones, except that the UVIVF one was stopped down to f/13.

Visible spectrum:
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The UVIVF one shows the same color shift to blue as the far gone lemon:
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UVIIRF:
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I packed it back together and it is sitting on the shelf for a few days to develop :smile: .

Edited by Øivind Tøien, 18 December 2020 - 07:02.

Øivind

#20 dabateman

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Posted 18 December 2020 - 12:24

Be careful with the development time. You don't want it going to far to spores.