A "correction" of this kind of color cast in Software may result in a visible usable image file, but spoken from a point of lithography view, these files will give a hell of headaches to everybody trying to convert to CMYK -correct and print these in a qualitative way. Of course if you only work for the internet or RGB that may get through somehow, but if I remember right, most of us are still getting their life paid by the printing industry products.
Ask any litho guy, he will tell you the truth about such files.
Stefan,
This statement is completely lacking scale.
It's very simple: CYMK conversion, moderate/severe Photoshop corrections, or large pre-processing adjustments (e.g. pushing shadow detail a stop) require there be reserve dynamic range and tonal smoothness in the file.
Certainly for strong color casts the LCC uses up all of it's reserve dynamic range and tonal smoothness in the correction which means further adjustments (e.g. Photoshop or CYMK conversion, or shadow adjustments) will be straining the quality of the file.
But for minor and moderate color casts, and digital back files shot at Low ISO I would very strongly say your statement is simply not true. The LCC process uses a small amount of the reserve of dynamic range and tonal smoothness in these cases. Further work such as Photoshop, CYMK conversion, or shadow adjustments will still have plenty of meat left.
So I both strongly agree with you, and strongly disagree with you: depending on the scale. One cannot simply paint all color cast in the same light.
Severe color cast is a major issue; light color cast is not (as dozens of photographers on this board can tell you from hands on experience).
Given that most back/lens/movement combinations fall into the category of "light color cast" this is a very important distinction.
Kudos however for developing a solution that allows the use of the 17TS/24TS (as well as your own shift optics and a good variety of other lenses) with a digital back. We had a chance to review the Hartblei Cam early in your release/marketing of it and at that point the Canon mount was not ready to ship so we have not had the chance to play with that element. But the build quality and overall functionality of the system was quite impressive.
Doug Peterson
(e-mail Me)
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