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sd Quattro + KG3

Infrared
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#1 GaryR

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Posted 01 June 2020 - 04:57

These were all taken with the Sigma sdQH + 70mm Art lens + KG3 filter. Quite different results than the IR Chrome filter, that I had been using. Surprised that I was able to add some yellow to the mix, with the KG3.

Poppy
Attached Image: _SDI0569.JPG

Cornflowers
Attached Image: _SDI0571.JPG

Viburnum Leaves
Attached Image: _SDI0579.JPG

Iris and ferns
Attached Image: _SDI0583.JPG

#2 Cadmium

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Posted 01 June 2020 - 05:04

Gary, very nice photos. I especially like the second one.
KG3 transmits the visual range, so why would yellow be surprising? I don't understand.

Attached Image: KG3_2mm_vs_KG5_1p5mm.jpg

Edited by Cadmium, 01 June 2020 - 05:08.


#3 colinbm

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Posted 01 June 2020 - 05:04

Good looking photos Gary.
Why are you surprised with the yellow ?
Using the KG3 alone is almost full spectrum any way....?

#4 GaryR

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Posted 01 June 2020 - 06:20

I'm surprised by the yellow, because the Quattro produces an over-abundance of red. Even with the KG3, there was still a lot of red SOOC, so I used NIK Pro Contrast (Color Correction), to further attenuate the reds.

NIK Pro Contrast is my Go-to app for any Sigma camera that I've owned, but it's hard to predict how any filter will work on the Quattro/foveon sensor.

#5 colinbm

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Posted 01 June 2020 - 06:28

I have yet to learn this, Thanks Gary.

#6 GaryR

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Posted 01 June 2020 - 15:56

Steve,
I've been wanting to try a KG3, ever since you mentioned it. I ordered a 52mm version, so I could also try it on my Sony a7R for NS aerochrome...and it does perform much better than the X-nite CC2, that I had been using.

The filter thread on the Sigma 70mm macro Art lens, is only 49mm, so it's an easy way to test standard size filters with the Quattro. In full spectrum mode, the sdQH seems to produce a lot more red than the Merrill, with the exclusion of yellow, so the KG3 will be a good starting point to experiment with.

#7 GaryR

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Posted 01 June 2020 - 16:45

Colin,
I've been using NIK, since Google purchased it from Nikon, but it's quite intuitive and easy to learn. The current paid DxO version works much the same, except it's better supported on Win10 and MacOS.

Here's a SOOC Quattro/ KG3 shot, showing a lot of red.
In PS, I first select Color Efex Pro, in the NIK menu.
Attached Image: nikpc1.jpg

In the popup menu, I then select Pro Contrast
Attached Image: nikpc2.jpg

This image shows the Correct Color Cast' slider moved all the way the right, just to show the extreme setting.
A quick adjustment with the Contrast sliders, and you're done.
Attached Image: nikpc3.jpg

Here's the final result, with reds slightly attenuated.
Attached Image: nikpc4.jpg

#8 Cadmium

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Posted 01 June 2020 - 18:05

Gary, Wow, another beautiful photo!

#9 GaryR

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Posted 01 June 2020 - 20:34

Thanks Steve!

#10 colinbm

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Posted 02 June 2020 - 03:04

Thanks Gary, yes there is a lot hiding in that red.

#11 GaryR

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Posted 03 June 2020 - 20:56

You're right Colin. There is a lot more color information hiding in the red. Here's the histogram, when importing the .X3F file, directly into Affinity Photo. I'm only using Affinity to show the histogram. Sigma Photo Pro gives the best results for .X3F files.
Attached Image: histogram.jpg

Here's a couple quick shots, processed with NIK Pro Contrast.
Hostas
Attached Image: _SDI0600.jpg

Allium ornamental onion
Attached Image: _SDI0597.jpg

#12 Cadmium

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Posted 04 June 2020 - 00:46

Gary, Hostas, amazing!

#13 colinbm

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Posted 04 June 2020 - 00:51

Thanks Gary