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UltravioletPhotography

[Filter Test] BaaderU, Hoya U360 Stack, StraightEdgeU (v2016): Two Different Conversions per Filter


Andrea B.

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To better show the possibilities of my four UV-pass test set filters used in the StraightEdge IR-Forcing Test, I tried two different, artistic (I hope!) white balance renderings for each filter. I also pushed the saturation so we could better see what false-colours might be brought out.

 

This effort was not at all meant to be precise or accurately reproducible. I just wanted to play, hoping that readers might feel similarly inclined and come up with some interesting renderings for their own UV photographs.

 

The sunflower leaves are very UV-reflective and take on a very interesting shiny, metallic appearance in UV. This sunflower has a small UV-absorbing patch on the base of each ray which makes a dark ring around the dark central disc. Like every other sunflower I've ever UV-photographed, the rays are UV-reflective and produce a nice bright false-yellow colour.

 

It was a bit windy. So any focusing errors can be blamed on that. [Focusing errors could not possibly be the photographer's fault, could they?? Just kiddin'.] Indeed just before shooting the 4th set, the sunflower pot rolled off its prop and had to be re-propped. There was no hope of matching the original pose, but we all soldiered on.

 

Filters (in alphabetical order)

  • BaaderU
  • StraightEdgeU
  • U360 (2.00mm) + S8612 (1.75mm)
  • U360 (2.00mm) + S8612 (2.00mm)

EDIT: 14 Mar 2017

I have the thicknesses of the filters mislabeled on a couple of the photos. The filter thicknesses stated just above are the correct ones for all posted photos using a U-360 + S8612 stack. It was a bad cut-n-paste job! :D

 

In the first white balance set, the Photo Ninja white balance dropper was drug around over the big leaf just under the sunflower. As mentioned, I was not precise and did not intend to be. When the saturation was pushed, golds and greens appeared.

Here is a small composite of those four results. Separate larger photos are attached below.

sunflower4_set1.jpg

 

In the second set, the Photo Ninja white balance droper was drug from upper right to lower left to produce a kind of averaged white balance. Again I did not intend to make a perfect diagonal drag. This time the saturation push revealed violet-blues and blues.

Here is a small composite of those results. Seperate larger photos are attached below.

sunflower4_set2.jpg

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Nikon D600-Broadband + UV-Nikkor 105/4.5 + RRS GroundPod

f/11 for 1" - 3" @ISO-400

White balance on leaf.

 

forceTest_uvU360-200+S8612-200_Sun_20160825_MidtwnNJ_13292830pnpnScenic100.jpg

 

forceTest_uvBaaderSun_20160825_MidtwnNJ_13020690pnpnScenic100.jpg

 

forceTest_uvU360-200+S8612-175_Sun_20160825_MidtwnNJ_13060400pnpnScenic100.jpg

 

forceTest_uvStraightEdgeSun_20160825_MidtwnNJ_13040700pnpnScenic100.jpg

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Nikon D600-Broadband + UV-Nikkor 105/4.5 + RRS GroundPod

f/11 for 1" - 3" @ISO-400

White balance on diagonal (before crop).

 

forceTest_uvU360-200+S8612-200_Sun_20160825_MidtwnNJ_13292830pnWB2.jpg

 

forceTest_uvBaaderSun_20160825_MidtwnNJ_13020690pnWBv2.jpg

 

forceTest_uvU360-200+S8612-175_Sun_20160825_MidtwnNJ_13060400pnWBv2.jpg

 

forceTest_uvStraightEdgeSun_20160825_MidtwnNJ_13040700pnWBv2.jpg

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I like the last set (WB on the diagonal) the best. I think it's because the blues and yellows do that complementary color thing (or almost complementary -- isn't the complement of blue orange, not yellow?).
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