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Accidental IR-filter, a bit like Aerochrome?

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#21 UlfW

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Posted 12 August 2017 - 18:04

In post #1 I have shifted the hue and decreased the saturation to get a more AIR-like look.

The Pixonyx filter is not useful for simulating an AIR style, but might be useful anyhow as it give a G-IR image with a very dominant IR signature directly out of the camera after white balance.
It cancels most blue and red parts of the image quite well.
The CA was as expected terrible in IR with my normal Canon EOS lenses.

Recently I think I have successfully gotten a good AIR-simulation with my B+W orange filter (040), with all red objects turning yellow.
The B+W 040 is close to the O-56 mentioned by Bjørn at Digital EIR Experiment . The B+W 040 is based on the Schott OG550 glass.

The image is just a a quick snapshot out from my balcony of the first red objects I could find. No taillights in sight.

I used the PS-action Tiffen12 after white-balancing in PhotoNinja at a neutral area
After the PS-action I have just slightly tuned the hue a little bit towards red and decreased the saturation slightly, to get closer to the tone in the nice image by Bjørn at Digital EIR Experiment
Attached Image: _MG_6460s.jpg

I also tried the B+W filters 022 and 090 (GG495 and OG590) on the same scene, but the results from the action wasn't useful the same way as images taken with the 040-filter.

The glass types used for the B+W filters can be found in https://www.schneide.../BWHandbook.pdf

Edited by UlfW, 12 August 2017 - 18:18.

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#22 Cadmium

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Posted 14 August 2017 - 01:40

Ulf, Very nice shot. I like the colors.
Here is one with a Wratten #12 gel filter rear mounted behind a Nikon 10.5mm 'fisheye' lens, processed with the PS action from HH:
https://www.flickr.c...157625180442120

Attached Image: EIR_W12_10p5_1280wB.jpg

#23 OlDoinyo

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Posted 14 August 2017 - 02:32

This thread may be straying a bit from its original topic, but since others are posting Tiffen 12 shots, here are a couple of my recent ones. The Sony A900 was used with the Steinheil Cassar-S and the aforementioned filter. Workup was via the Pixelbender macro pursuant to J.W. Wong's mathematical work.

"Cascade Mountain and Provo Canyon:"
Attached Image: Cascade Mountain and Provo Canyon j small ex DSC00131p.jpg

"Timpanogos from Round Valley:"
Attached Image: Timpanogos from Round Valley j small ex DSC00159.jpg

#24 UlfW

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Posted 16 August 2017 - 04:58

I ordered a second Pixonyx green to use the glass rear-mounted on my fisheye lens.

The new one is not at all as dense and dark green as the first one. It transmits a lot of red.
When stacking with a OG590 I see almost as much red as without the new Pixonyx green.
The result from the same test with the old dark green filter is almost black.

I asked Pixonyx if they still had the original dark green type. The answer was "Sorry, not available anymore".

It would be interesting to know if any of the members that bought the Pixonyx green got the dark green type.
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#25 Andrea B.

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Posted 16 August 2017 - 17:32

One can sometimes figure out a filter type by looking at the raw composite of a photo before white balance is applied. Many of the filters we use have characteristic raw signatures.
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#26 Cadmium

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Posted 16 August 2017 - 18:48

Clark, those are exceptional! I tried and tried but was not able to get Pixelbender to give me good results. Wish I could get it to work.
So far, I can't get anything I am happy with from the Pixonyx either. Maybe someday...

#27 OlDoinyo

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Posted 17 August 2017 - 03:45

Would the MidOpt BN532

http://midopt.com/filters/bn532/

be a suitable substitute for the discontinued Pixonyx filter?

Results using the Pixelbender/Wavelength Pro method of workup seem to vary somewhat with the camera used; I do not know why this should be so, but I have often found others' files more challenging to work up than my own. Two things do seem to help: using a custom white balance to shoot the original frame, and if necessary, doing a calibration to get the slider parameters in the ballpark (one protocol is suggested in a post on Flickr's Digital IRG group.) A lot depends on getting the parameters right, and this takes a little practice and some understanding of what the parameters do. The upside is that correction can be finely tailored to individual equipment or even images rather than applying a generic correction. The default slider settings are close to correct on my camera, but most likely less so on yours.

#28 Cadmium

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Posted 17 August 2017 - 06:27

Clark, Remember that guy on there who was one of the first posters, who had the beam splitter setup?

#29 Cadmium

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Posted 17 August 2017 - 06:42

Here is one of my favorite EIR simulations I did. I can't find my PixelBender examples right now. :-/
Attached Image: 54_1zcx_eir_12.jpg

#30 Andy Perrin

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Posted 17 August 2017 - 17:27

OOOH, Cadmium, that's lovely!

#31 DonPilou

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Posted 21 August 2017 - 12:35

Good morning everyone,
Thanks a lot to @UlfW to having started this thread. All the comments show very interesting content to tried to simulate aerochrome. I ordered the Pixonyx green filter two weeks ago and spent a large part of my holidays shooting with it. Now that I am back at work I am starting the processing of the files.
Here are 3 examples taken with a Canon 6D FS and the 16-35 F/4 IS. I found a low level of CA even at 16mm, but I think the results will be better with the Tokina 21mm, so I will compare the results with Tiffen #12 this afternoon.

Attached Image: Pixo_1.jpg


Attached Image: Pixo_2.jpg


Attached Image: Pixo_3.jpg



#32 DonPilou

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Posted 21 August 2017 - 16:10

So I come back with some news. I made the Pixonyx VS Tiffen comparison, here it is :
  • Pixonyx Green FIlter, Canon 6D FS, Tokina 21mm F/3.8

Attached Image: Pixo_4.jpg

  • Tiffen #12, Canon 6D FS, Tokina 21mm F/3.8

Attached Image: Tiff_1.jpg


The exposure was fixed to the same value. To my point of view, the Tiffen #12 is really great to simulate EIR colors with a single shot (it is not a big news, as I have read here and in Flickr). the Pixonyx green filter is good too for its price, but it suffers from more CA than the Tiffen on my gear configuration.

Here is another picture taken with the Tiffen #12 with the same configuration, to practice digital processing with this filter :

Attached Image: Tiff_2.jpg


I shot then some other pictures with the Canon 16-35 F/4 IS instead of the Tokina, only with Tiffen. I wanted to check the amount of CA at wide angles. This amount is acceptable at 16mm and good at 20mm. Here is the picture taken at 16mm.

Attached Image: Tiff_3.jpg



#33 Andy Perrin

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Posted 22 August 2017 - 05:27

Both seem to do a nice job. The first Pixonyx shot is my favorite.

#34 Andrea B.

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Posted 22 August 2017 - 15:29

I am following this topic avidly. All these IR film emulations are very interesting. I wish I knew more about them all.

*****

I am thinking about re-titling this topic to indicate that it has gathered several varieties of IR film emulations. I will write to Ulf and check with him on that.

*****

Does anyone know of a "color map" which tells us how original visible colors are translated to Aerochrome or EIR colors? I'm sure there is something out there on the internet when I get a chance to search, but some member might already have a link?? I'm asking because I think that Photo Ninja might offer a fairly easy way to produce an EIR or Aerochrome emulation using the Color Correction patches and their hue sliders. (See this tutorial: Hoya B-410 Red Blocker --> EIR: Photo Ninja Tutorial)
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#35 OlDoinyo

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Posted 23 August 2017 - 16:13

The iconic IRG diagram, courtesy of J.W. Wong:

https://www.flickr.c...ong/4582442103/

The single-image method, by the same author:

https://www.flickr.c...ng/35117360304/

Aerochrome film works by scrambling the dye couplers so that the equivalent of a channel swap occurs. One of the emulsion layers is IR-sensitive; blue light is excluded via filtration on the lens.

#36 Andrea B.

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Posted 23 August 2017 - 20:20

Thank you for the link!

Actually I think this isn't new to me. I just thought I might have missed something. :D

R(infrared) + G(red) + B(green)
RirGrBg
IRG

Just fiddling with notation.
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#37 Cadmium

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Posted 24 August 2017 - 07:07

It would be nice is if everyone posted the exact processing they are using for their pics here.
The German Green filter doesn't seem to work in any way special for me.

Personally, I think the best pics in this topic are Clark's PixelBender landscape pics.

Edited by Cadmium, 24 August 2017 - 12:51.


#38 David475

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Posted 12 August 2019 - 22:41

View PostCadmium, on 04 August 2017 - 08:52, said:


Various green filters
Attachment DSC_1593a_4.jpg

Thanks cadmium. You test the tiffen green? Anyone? I could buy in mi thread size for only a few dollars. I hope some could review. Tha ks

#39 Andy Perrin

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Posted 12 August 2019 - 23:25

I posted my process in great detail here:
https://www.ultravio...dpost__p__28474

If you use the DB850 filter, which removes the light between 650nm and 830nm, stacked with Tiffen#12, then the multiplicative factors of 0.8 and 0.96 in the J.W. Wong single-image link become unnecessary since the 830-870nm light that the DB850 filter allows through contributes equally to all three channels.

Edited by Andy Perrin, 12 August 2019 - 23:29.