Jump to content
UltravioletPhotography

The bad mandarin in the basket etc.


otoien

Recommended Posts

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:

#1

2020-12-06-1549N-9057-md.jpg.d979bd63ee7896886240b026a1df7c41.jpg

 

 

UVIVF

#2

2020-12-06-1554N-9066-md.jpg.f6887bedf19ce41c52e99bff544e72a1.jpg

 

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:

#3

2020-12-12-2217N-9189-md.jpg.ae988179acbe98def67a85be846a5365.jpg

 

 

interestingly in UVIVF the mandarin looks more like a lemon or grapefruit, while microbat52's lemon looked more like a blood orange!

#4

2020-12-12-2221N-9196-md.jpg.a44b87ef6030316b6f70bb47c54ced1e.jpg

 

 

I did some more searching for other interesting colors in the kitchen and found some dried (sweetened) cranberries. Visual light:

#5

2020-12-13-0100N-9206-md.jpg.8d1f51a1a019698ed971ce226e287f6b.jpg

 

 

UVIVF:

#6

2020-12-13-0104N-9214-md.jpg.667dfd175a37a8c2d4aa1cfa3a6fb7d4.jpg

 

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.

#7

2020-12-13-0107N-9216-md.jpg.270f0c83fbaa531e6ffa75d08e6376b2.jpg

2020-12-13-0112N-9220-md.jpg

 

 

 

 

Link to comment

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.

Link to comment

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:

Link to comment

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. "-)

Link to comment

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.

 

2020-12-16-0020X-4933-md.jpg.063b42823b58f6d74d083186d2814aa5.jpg

Link to comment
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.
Link to comment
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?
Link to comment

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!

Link to comment

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:

#1

2020-12-17-1314N-9232-md.jpg.f4cf58c5fb9178868066c4a6d67ab4ae.jpg

 

 

The UVIVF one shows the same color shift to blue as the far gone lemon:

#2

2020-12-17-1318N-9236-md.jpg.9ac9226a22a510cdcbfe2de7b535d4d3.jpg

 

 

UVIIRF:

#3

2020-12-17-1446X-4942.jpg.1597ce58624f406740d1b89ea26b1102.jpg

 

I packed it back together and it is sitting on the shelf for a few days to develop :smile: .

Link to comment

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
×
×
  • Create New...