I should have clarified what I meant by notable, and perhaps a better adjective would have been detrimental...
For the veracity of the thread however, I will post the challenged example... A test image of the 24 digitar in front of my P45+ on a Horseman with about 10mm of rise cranked in. There is some color shift in the sky and some in the foreground, but IMO not as "notable" as Don's samples. The same shot done zeroed shows "no notable" color shift in the sky, but still has a tad in the foreground:
That looks really good Jack. Detrimental sounds like the perfect word, the color shift is there, but no one is going to care. Figuring out a way to deal with your back and it's very subtle color shifts is tricky. If you decide not to shoot the plexi for every shot, then you won't be able to correct an image where the shift becomes too much based on the subject matter.
The 22MP Dalsa sensor has similar, but even more subtle color casts. I worked with one for months without figuring out the color problems ( I did often look around the room to try to find the source on the color shift in the lighting). Once the 33MP backs came out I really had to learn a lot more about color uniformity on these sensors and now can easily see color casts in my images made with the Aptus 22. The image below was made with the 22MP sensor. The color shifts are not detrimental, but are definitely there.
Another source of color shifting on these backs is from the IR filter itself, which can create a Red/Cyan shift. Even if Dalsa or Kodak came out with a sensor that eliminated the magenta/green casts, the IR filter shift would still require corrective measures on lenses like the 24, and with other lenses using large shifts. Many here know that Leica picked a very light IR blocking filter to avoid the red/cyan shift with their wide lenses. The result was a camera that would often shift black textiles to a purple tint.
I'm not trying to turn anyone off these cameras or backs. I use one for all my work, and feel that the quality or the images and the flexibility of the systems are worth having to deal with the non-uniformity in the color. I am rather shocked that I have never met anyone who owns or is testing a system like this that has gotten a good tutorial from their dealer about the color uniformity of their back, the causes, and the solutions.