One problem with full sized imaging chips, that does
sound plausable, is related to the geometry of the
sensor cells. They are somewhat like "photon buckets"
with a certain depth. If light doesn't come straight in
it is blocked by the walls of the bucket. This becomes a
significant factor towards the edge of the chip since
the light rays coming from the lens are at an angle.
This was the reason given for significant light falloff
for an early Kodak DSLR with a full sized chip. The only
way to avoid the problem would be to use a larger
diameter lens, or apply some sort of transform function
to the chip output.
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