I am having some problems finding a way to get a handle on the quantum efficiency gains of my debayered Canon 450D. I can find references to the stock colour camera's QE (which is listed as 33% by Sensorgen) but how do I translate the QE for a mono sensor in which every pixel is gathering photons without that bayer matrix blocking some? I read that a colour CMOS sensor is about 1/5 as efficient as a mono sensor. I would like to be able to plug my camera sensor details into something to work this QE improvement out. Pixel pitch is 5.2, APS-C sensor, 12.2 mega pixels. Sensor test data is here:
http://www.sensorgen.info/CanonEOS-450D.html
This sensor is cooled (cold finger behind the sensor itself) and runs at below 0C - where Darks and Bias Frames are equal when stretched. So thermal noise is not an issue.
The mod process removed the microlense layer so I know that has some negative impact on QE but how much and isn't this simply overcome by running longer subs.
Any ideas on working this out?