I haven't received my IQ3 100MP yet due to the earthquake, but a friend of mine found a problem with it:
If darkframe noise reduction is disabled with "Aerial Mode", the IQ3 100MP gradually fills up shadow with red color cast if the exposure time is over 2 minutes.
Below is an example:
IQ3 100MP + Rodenstock 50mm HR-W, 32 minutes:
Note that it's not a white balance problem. Adjusting white balance does not fix the red color cast in shadow.
Here is another example:
IQ3 100MP + Rodenstock 23mm HR-S, 2 minutes vs 7 minutes:
Note that this is not a lens color cast issue, because LCC has been applied and the 2 minute exposure does not suffer from this red shadow problem.
After I looked into these examples, I recalled that when I first tested the IQ3 100MP about 6 months ago I did notice that the darkframe of the 20 minute long exposure looked red.
For comparison, the IQ250 does not have this issue at all.
Here is a real world picture I made with the IQ250:
IQ250 + Rodenstock 40mm HR-W, 8 minutes:
There is no red color cast in the shadow at all.
Then I looked into the darkframe files with RawDigger:
It appears that there is no red color cast of shadow in RawDigger, and there are no higher values of the red channel reported. To me it looks like a bug in Capture One. Hopefully this issue can be fixed in the next version of Capture One.