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Pete:
You may remember our discussion on this subject when I was setting up my CT-100. I found it helpful to use a device I had had for a long time. Its a TV-Color-Komparator made by Hellige GMBH in Giesbrecht Freiburg, West Germany sometime around the early '80s. It's specifically calibrated for D 6500 degrees and while this is not dead on NTSC C at ~6700 degrees it's certainly close if you tweak the whites just slightly bluer than what the match is on the Komparator. It made the job a lot easier once I knew what to do with it.
The attached pictures show the device The side shot has the entrance pupil on the left and the viewing eyepiece on the right. The knob in the middle is for changing the brightness of the comparison illumination. The top shot shows the meter used to set the calibration for brightness and color temp. I've never gone hunting on ebay for one of these, but they might pop up once in a while.
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