Originally posted by Blue I keep seeing it referred to as a "custom sensor." I don't see how it could be an off the shelf sensor and be used in other cameras and fit that criteria. Plus, it is a 12.3 mp whereas the K-x is 12.4.
Hmm. That info you've posted is more on the microlens array used to reduce vignetting, similar to what - heh - Leica used on their digi Ms. Very interesting to know, anyway, and that highlights one of the advantages of the fixed lens: you can tailor the sensor to lens, or at least compensate for inadequacies in the lens that might otherwise require you to use a larger/slower lens or expensive aspherical or high-refractive elements.
Judging from some quick googling, a lot of Fuji cameras use BSI sensors, so maybe they've just become so commonplace in the Fuji world they haven't thought to mention it.