[click on images to see larger ones]
and here the "scientific version of it:
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Monday, July 11, 2011
[UV] "dancing" Rudbeckia
Just an "artsy" shot today, called "dancing"
[click on images to see larger ones]
and here the "scientific version of it:
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on images to see larger ones]
and here the "scientific version of it:
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Saturday, July 9, 2011
[UV] UV color of a flower leaf
Today about why leaves do have some false UV color when shooting reflected UV. So a quick reflectrometric experiment sheds some light into that, here using a Rudbeckia hirta and a Rudbeckia fulgida leaf and comparing them with reflected UV shots.
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
Standardized false UV color normal and high intensity palette:
The R. hirta leaf on the left shows some greenish/grayish reflection with some violet on it depending on angle. The spectrometeric result reveals, that indeed the highest UV reflection is in the violet sub UVA range, wheras there is also some in the yellowish/brownish sub UVA range, but only a little reflection in the greenish sub band.
The R. fulgida leaf on the right shows some greenish/yellowish reflection and not much angle dependency. The spectrometeric result reveals, that it has quite an even UV reflection, which reaches quite deep into the UVA range to about 310nm and has proportionally a higher green / yellow content than R. hirta.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
Standardized false UV color normal and high intensity palette:
The R. hirta leaf on the left shows some greenish/grayish reflection with some violet on it depending on angle. The spectrometeric result reveals, that indeed the highest UV reflection is in the violet sub UVA range, wheras there is also some in the yellowish/brownish sub UVA range, but only a little reflection in the greenish sub band.
The R. fulgida leaf on the right shows some greenish/yellowish reflection and not much angle dependency. The spectrometeric result reveals, that it has quite an even UV reflection, which reaches quite deep into the UVA range to about 310nm and has proportionally a higher green / yellow content than R. hirta.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[UV] getting closer, using diopter lens
Today about getting closer for reflected UV work. The old and simple method is to add a diopter (meniscus) lens. Will that work also here?
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
Standardized false UV color normal and high intensity palette:
It seems to work well obviously and the loss of UV transmission got compensated and the colors also acceptably represented (after proper whitebalancing).
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
Standardized false UV color normal and high intensity palette:
It seems to work well obviously and the loss of UV transmission got compensated and the colors also acceptably represented (after proper whitebalancing).
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Thursday, July 7, 2011
Wednesday, July 6, 2011
[UV] whitebalancing using a 35mm wide angle lens for UV
Today I made some experiments using wide(r) angle lenses for shooting reflected UV using my UV sensitive camera.
I had previously written about proper whitebalancing to reach a standardized false color UV palette using a true apochromatically corrected UV lens and also about doing that for other wide angle lenses. Now I wanted to reach about the same "colors" using such a lens which transmits much less UV, in that case here a 35mm c-mount lens.
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
The normal and high intensity palette:
The reflected UV images show a Rudbeckia hirta flower. Left the result before applying my whitebalancing procedure; on teh right after whitebalancing using my ReflectionDisc (and some special in-camera tweaking):
[the colors on the left image are NOT according to the standardized palette!]
Well, as you can see, about the same colors could be reached on the right image, still a little different, as some parts of the spectrum are missing (the shorter wave UV-A sub-bands more specifically, so there is no green as that lens only transmits to about 350nm). Still it gets evident that this Rudbeckia flower has a UV reflection from its petal tips of around 360nm.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
I had previously written about proper whitebalancing to reach a standardized false color UV palette using a true apochromatically corrected UV lens and also about doing that for other wide angle lenses. Now I wanted to reach about the same "colors" using such a lens which transmits much less UV, in that case here a 35mm c-mount lens.
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
The normal and high intensity palette:
The reflected UV images show a Rudbeckia hirta flower. Left the result before applying my whitebalancing procedure; on teh right after whitebalancing using my ReflectionDisc (and some special in-camera tweaking):
[the colors on the left image are NOT according to the standardized palette!]
Well, as you can see, about the same colors could be reached on the right image, still a little different, as some parts of the spectrum are missing (the shorter wave UV-A sub-bands more specifically, so there is no green as that lens only transmits to about 350nm). Still it gets evident that this Rudbeckia flower has a UV reflection from its petal tips of around 360nm.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Monday, July 4, 2011
[UV, VIS] Zinnia - more on short wave UV reflection
I was shooting Zinnias today, when I saw one which sported that greenish short wave UV-A sub band reflection as mentioned here before..
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
The normal and high intensity palette:
The reflected UV image shows that this Zinnia flower variant has a greenish / yellowish short wave UV-A reflection in the 340-360nm range:
VIS shot for comparison:
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
The normal and high intensity palette:
The reflected UV image shows that this Zinnia flower variant has a greenish / yellowish short wave UV-A reflection in the 340-360nm range:
VIS shot for comparison:
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[UV, VIS] Zinnia flower competing
I was shooting Zinnias today, when I saw one flowering aside another bright yellow flower. I noticed the Zinnias being frequently visited by bees and bumblebees, whereas the similar looking yellow one had only few guests.
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
The normal and high intensity palette:
Well, the reflected UV image shows clearly how that Zinnia flowers wins the "competition":
Even covered by other plants it makes itself clearly seen (see blurry BG Zinnia). So not really "competition" for that UV-bright Zinnia (340-360nm).
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on images to see larger ones]
Standardized reflected false UV "colors" according to the previously described "UV color palette" related to wavelength.
The normal and high intensity palette:
Well, the reflected UV image shows clearly how that Zinnia flowers wins the "competition":
Even covered by other plants it makes itself clearly seen (see blurry BG Zinnia). So not really "competition" for that UV-bright Zinnia (340-360nm).
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
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