voidshatter
Member
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.
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.