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UltravioletPhotography

Photos with Various Schott & Hoya Filters :: K5 + UAT85/4.5


Andrea B.

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Pentax K5-Broadband + Asahi Ultra-Achromatic-Takumar 85/4.5

 

Baader UVIR-Cut

f/8 for 1/60" @ ISO-160 EV+.7

K5 color profile applied in Photo Ninja. White balance made on white target.

This is the flower called Glory-of-the-Snow, a member of genus Chionodoxa.

The colour is a light purple, accurately depicted here.

visBaadUvirCut_k5Uat85_f81-60iso160_20150407wf_154025pn.jpg

 

 

S8612 IR-Block (1.75mm)

f/8 for 1/60" @ ISO-400

K5 color profile applied in Photo Ninja. White balance made on white target.

This filter does not restore the original colours of the modified K5.

The flower appears too blue. Red is missing from both the flower and the background.

visS8612_k5Uat85_f81-60iso400_20150407wf_160542pn.jpg

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Pentax K5-Broadband + Asahi Ultra-Achromatic-Takumar 85/4.5

 

B+W 093 IR-Pass (~2mm)

f/8 for 1/15" @ ISO-160 EV+1

ir093_k5Uat85_f81-15iso160_20150407wf_154219pn.jpg

 

 

BG3 Dual Bandpass (2mm)

f/8 for 1/60" @ ISO-160

irBg3_k5Uat85_f81-60iso160_20150407wf_154338pn.jpg

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Pentax K5-Broadband + Asahi Ultra-Achromatic-Takumar 85/4.5

 

BaaderU UV-Pass

f/8 for 2" @ ISO-800

uvBaadU_k5Uat85_f82iso800_20150407wf_154646pn.jpg

 

Hoya 360U (2mm) + S8612 (1.75mm)

f/8 for 2" @ ISO-800

uvU360S8612_k5Uat85_f82iso800_20150407wf_155400pn.jpg

 

Hoya 340U (1mm) + S8612 (1.75mm)

f/8 for 1" @ ISO-1600 = f/8 for 2" @ISO-800

uvU340S8612_k5Uat85_f81iso1600_20150407wf_155304pn.jpg

 

Hoya 330U (1.5mm) + S8612 (1.75mm)

f/8 for 1/8" @ ISO-800

It is obvious that this combination does not pass UV-only.

uvU330S8612_k5Uat85_f81-8iso800_20150407wf_154948pn.jpg

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Pentax K5-Broadband + Asahi Ultra-Achromatic-Takumar 85/4.5

 

Schott UG11 (.75mm) + S8612 (1.75mm)

f/8 for 1/1.3" @ ISO-1600 = f/8 for X" @ ISO-800

uvUg11S8612_k5Uat85_f81-1.2iso1600_20150407wf_160025pn.jpg

 

Schott UG5 (1.5mm) + S8612 (1.75mm)

f/8 for 1/6" @ ISO-800

It is obvious that this combination does not pass UV-only.

uvUg5S8612_k5Uat85_f81-6iso800_20150407wf_155814pn.jpg

 

Schott UG1 (1mm) + S8612 (1.75mm)

f/8 for 1.3" @ ISO-800

uvUg1S8612_k5Uat85_f81.3iso800_20150407wf_155632pn.jpg

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Looking closer at the BG3, a cool filter for IR work.

My version is 1.5mm thick. I haven't tried it in any stacks yet. But with an S8612 it will give some combination of UV+ Blue + Cyan + a little bit of Green.

Thanks to Ebay Uviroptics for the charts!

 

BG3.JPG

BG3+S8612.JPG

BG3+S8612_multi.JPG

 

 

BG3 only. Here is how the raw looked - demosaiced in Photo Ninja with exposure box checked.

No colour adjustments made.

irBg3_k5Uat85_f81-60iso160_20150407wf_154338pnDemExp.jpg

 

The 'raw' foto with Red and Blue channels flipped in PS Elements 11.

irBg3_k5Uat85_f81-60iso160_20150407wf_154338pnDemExpRBFlip.jpg

 

The 'raw' foto with white balance made on the flower and yellow moved +30 towards green in Photo Ninja.

irBg3_k5Uat85_f81-60iso160_20150407wf_154338pnDemExpYellow+30.jpg

 

Version originally presented above.

White balance was made on one of the light background blobs in Photo Ninja.

Blue saturation was increased +50. K5 colour profile and Scenic colour correction applied.

irBg3_k5Uat85_f81-60iso160_20150407wf_154338pn.jpg

 

Edit: added 'a little bit of'.

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Looking closer at the UG5 + S8612 - with some charts from Ebay Uviroptics (thank you!).

UG5+S8612.JPG

 

Here is the demosaiced version of the foto posted above. Again Photo Ninja was used for the conversion.

uvUg5S8612_k5Uat85_f81-6iso800_20150407wf_155814pnDemOnly.jpg

 

 

Now add the exposure data - includes camera gamma curve which lifts the midtones.

uvUg5S8612_k5Uat85_f81-6iso800_20150407wf_155814pnDemExp.jpg

 

 

I somewhat arbitrarily chose a light background blob to use again for the white balance step because in the BaaderU foto above those bkg areas were neutral. But it is interesting that the leaves are dark yet the flower does not show the darker center area that it does in the other UV fotos.

uvUg5S8612_k5Uat85_f81-6iso800_20150407wf_155814pn.jpg

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BG3: "But with an S8612 it will give some combination of UV+ Blue + Cyan + Green"

Nope, you won't get any green, check the charts, nothing from 500nm onwards

(allright that little bit 480-500nm you'll get)....

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I completely messed up this post. Will try to fix it later. Sorry 'bout that!! Erased it for now. :)

 

Added: I edited my statement above to say 'a little bit of green'.

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I thought I should have some knowledge about other filters so I have been gradually collecting a few.

 

Next up is a nice set of PrecisionU, AndreaU and CopperU. It will be fun to work with those and add some comparisons of their characteristics. I had worked with a couple of the prototypes, but wanted to get more useful 52mm versions which I find easier to use.

[ Everybody else's mileage may vary on the 52mm preference. ;) :lol: ]

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