Komodo w/ Schneider ND - Severe IR pollution? Blacks turn Maroon, help!

[Brett_M]

I have a Komodo with Sigma 18-35 and a Schneider 4X5.65" ND 1.8 filter,
The filter has made blacks (perhaps only synthetic fibers) turn Maroon. Notice in the examples the cotton jeans remain black, his poly jacket which is black is now maroon and his sweatshirt which was black is matching maroon. This also happened to me on a commercial shoot and I never could figure it out or fix it.

Can someone tell me why this is happening? Is it particular to the Komodo sensor or this Schneider Filter?

Also I would appreciate any guidance on how to color correct it! The Maroon is hard to isolate since its supposed to be in so much of the image elsewhere.

Two example frames-
https://www.dropbox.com/sh/g6spt9fxqh5dnmd/AADKzaZmKp5u55KYaEQYNJlta?dl=0

Thank you for your help

 

[Stephen Pruitt]

I'd definitely like to know is others are experiencing IR pollution with the Komodo. This reminds me of the bad old RED One days!

Stephen

 

[Randall Weatherington]

I do not know if this is a factor, but I used to manage a still photo lab.
We had wedding photographers occasionally complain of wedding dresses that had a slight cyan tint to them.
We discovered that it was the polyester material in the dress that was causing the phenomenon.
Polyester is slightly refractive. The light goes in, and partially refracts out from the outside of the fiber.
Even in the visible spectrum, polyester is a problem.

 

[Rick Cook]

Yes, I have been in situations that caused IR issues with clothing specifically. Under intense sun on a shoot in Florida I really struggled. You absolutely need good IRND's for the Komodo and arguably every other digital camera these days. I had a Tiffen IRND Set and swapped to a cheaper NISI set after testing.

 

[Phil Holland]

If you are using "OG" NDs or even what I refer to as generation 1 IRNDs on any camera, you will be seeing IR contamination.

I"ll be updating my approved filter list shortly, but the main issue comes from older or bad filtration solutions. Some of which are still sold unfortunately.

 

[Stephen Pruitt]

If you are using "OG" NDs or even what I refer to as generation 1 IRNDs on any camera, you will be seeing IR contamination.

I"ll be updating my approved filter list shortly, but the main issue comes from older or bad filtration solutions. Some of which are still sold unfortunately.

Hey there, Phil. . .

I'm so glad you're joining this conversation. My current ND sets (I have one for each Komodo) are Tiffen 82mm 0.3 to 1.2. I suspect those aren't Phll-approved. My question is can I add a Tiffen standard hot mirror on top and fix any shortcomings with the filters I have? I really don't have the money to buy two new sets of filters at this point.

Thanks very much!

Stephen

 

[Alex Lubensky]

If you are using the screw-on ND's, I recommend looking at Hoya Pro ND's. I still use them for canon lenses and they don't show any visible IR pollution. Phil's an advocate for Breakthrough among filters, but I didn't use them and can't tell anything about them. Usually you can find Hoya at your local photography store, while Breakthrough is a rare find at stores.
Older Tiffens are bad, the worst filters I've ever used for a digital camera regarding IR Pollution. Though, they have a line which is called NATural and those are full-spectrum (fsnd) modern ND filters and are top-notch. Pricey though.

among 4x5,65 filters or other squares I recommend looking at NiSi IRND for price/quality, or Schneider RHOdium for best color. Arri FSND are out of reach for most costing whopping 800 usd per filter.