I read couple articles in the web. I was trying to find it for you. Unfortunately, I cannot find them. I am going to explain why I agree with their number based on my knowlege from wafer fab and cost of CMOS wafer. For 8 in wafer, the cost of a processed wafer is about $1000, throw in the micro lenses and AA fiter for extra $300 (my guestimate) So each wafer is $1300. My estimate is that there may be only 75 sites for the 8 inch wafer for APS-C sensor. Let us assume the yield for APS-C is 75 %, then we will have 56 sensor per wafer, $1300 per wafer, that will be $23 per sensor. There are 24 FF sensor site for 8 in wafer. Assuming the yield for FF is 25% (1/3 of the yield of APS-C, being pressimistic ). then each wafer will yield 6 FF sensor. that will be $210 per sensor.Canon can do a $2000 FF DSLR if they want to. Just look at the price of 7D. The difference in FF sensor and APS-C is about $200.
That's the first time I've seen that figure. Can you document it?
So the difference between FF and APS-C is $193. I said about $200 is just a rough number in case my guestimate on the micro lens and AA filter is wrong. IF Canon have moved the sensor production to 12 in (300mm) wafer, the difference is even smaller. However, Canon white paper mention that there are 200 site of APS-C sensor in a 8 in wafer. That is totally wrong. Anybody can prove it by drawing it out on a peice of paper.