Nikon DSLR - settings to compare colors

Question

I want to compare two lenses in terms of how they render color and contrast. To do this I want to take the exact same picture with both lenses. What settings do I have to set such that the camera does not change the colors digitally? Of course the exposure settings stay the same.
I shoot in 14 bit uncompressed RAW and open both pictures in photoshop. I dont change anything in camera RAW. The white balance is set to a fixed value in camera. I have also turned off active D lighting (which would not change the RAW file anyways). Is there something that I have forgotten?
Or should I dont care about in-camera settigs (except exposure) and just sync the settings of both images in camera RAW?

R Hall · Answer

Just make sure your exposure is the same and you have the exact same light in the scene. (meter it!) then process the Raw files exactly the same.  open the processed images in Photoshop and place one in a layer over the other using difference mode.
Flatten and invert.  What is visible/measurable here are the differences between the lenses.

Michael C · Answer

Depending on your selected Camera Raw default settings, you may need to insure that none of them are set to "auto" anything. Especially insure that it is not set to automatically override the white balance selected in-camera.
Noise reduction and sharpening settings can also affect the perception of contrast and even color. Again, be sure they're set to specific values, rather than any "auto-optimize" settings.

Nikon DSLR - settings to compare colors

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