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Budget Glass Aerochrome Filter stack


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Hi! Your budget filter guy here. I did alot of research on replicating Aerochrome,and visited this forum for information. I settled on a two filter stack. Both filters are Neewer and, besides both being marked Blue, they are not the same. One is a "Full Blue" filter sold by it's self. The other one is the blue filter out of a 9 color filter set. Stacking both gives a great result to replicate IR Chrome. Taking off the just the filter set blue, it desaturates the red, which can give a great picture where blue and orange/yellow stand out. With the #47, it was very interesting. I replicated IR Chrome using #47, tiffen hot mirror, and haze 2A. Which now confirms that this band pass filter let's in 400nm to 500nm and 700nm to 750nm. I Think Big Blue leans towards higher IR at least to 850nm. But the blue light and IR light are balanced without a hot mirror.

The chart compares exposure values at different nm. You can clearly see IR Chrome blocks a lot of infrared. Big blue allows all infrared to pass. With these tests I can also say IR Chrome let's in more visible red light. Big blue lets in no visible red light. Big blue has an exposure compensation(compared to full spectrum/No filter) for infrared light at +3.66 and for blue light at +1.33. (Irchrome data provided by Brian Champion)

 

Photo 1: exposure comparison chart

Photo 2: big blue filter F/8 iSo200 1/50s

Photo 3: big blue filter f/3.5 iso400 1/1250s

Photo 4: big blue filter f/8 iso200 1/125s

Photo 5: various flashlights with full spectrum blue/red/green light, lower right is 680nm and higher, upper right is 850nm

Photo 6: flashlights with big blue filter

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post-288-0-71604000-1578257351.jpg

post-288-0-57188000-1578257387.jpg

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Hi Namestom,

#47, Tiffen hot mirror, and Tiffen Haze 2A. All three stacked?

In camera white balance, no post?

 

Yes custom white balance, sooc areochome colors. Tiffen #47 passes blue/violet and infrared. The haze filters out the violet, making the dominant color just blue. The tiffen hot mirror has a cutoff at 750nm, which balances the blue and IR light. The quality was terrible due to using a haze and hot mirror together. But it proved what IRChrome is just plain optical blue glass, with a second filter that cuts off IR to balance the blue and Infrared light.

 

Photo 2:tiffen haze 2a + #47 + HM(on a cloudy day)

Photo 1:big blue(two neewer blue filters stacked)

Photo 3:neewer gels($10 for 2 sheets of every color). Blue and purple stacked.

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Hi Namestom. Should I call you Tom?

Thanks for the added info.

It is interesting seeing all the different ways people have for making red foliage.

I like your last shot the best, with the red. Do those gel filters have any specific numbers, just names? I see sets of those Neewer gel filters online, but I don't know if they are all the same.

I would guess that your gel filter stack would benefit from KG3 2mm stacked with it. KG3 2mm would clean up the whites and grays.

Your image looks very much like the Lee 729 (only) shots that David Twede posted, and then he shows the same with KG3 added.

https://next-eyes.bl...tal-ir.html?m=1

 

Birna sold me her IR Chrome, which I will test when time and weather permit, so then I will show how orange or red my results are with that.

I still like the red more than orange.

Orange is more common to get from many of the filters and stacks.

I have seen #47 often used for blue skies with yellow foliage, similar to BG3, or what LifePixel calls 'Super Blue'. Not my favorite look. Your examples look more like Hoya B-410, and like a lot of the blue Lee filters.

The closest I have got to red is with the Lee 729 filter (+KG3 2mm).

By the way, in case anyone is interested, KG3 2mm and KG5 1.5mm will work the same.

 

Also, if no one has seen it yet, David Twede posted some photos using a chocolate filter. Purple foliage with blue skies, and visual colors too. I plan to test that soon also.

https://next-eyes.blogspot.com/2019/

 

Thanks again for your formulas and photos.

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