A couple interesting things from luminous landscape
Microlenses aren't used on all imaging chips. For example Kodak's sensors
that are currently used in medium format backs (such as the 22 million pixel
KAF-22000CE, which has 9 micron pixels), does not use them, because while
adding microlenses would increase the overall Quantum Efficiency (discussed
later) of the sensor it would mean adding an additional optical element (the
microlenses) to the system. The resulting sensor would not then be
appropriate for use with swing / tilt lenses.
-- and a little latter
For example, Kodak makes the sensors used in Olympus DSLRs. The pixels in
the 5 Megapixel Olympus E1 are 6.8 microns, while those in the new E300 are
5.4 microns. But, two years have passed between the two generations of
chips, and the already excellent noise characteristics of the E1 are
retained in the E300, at least at lower ISO settings. This is due to changes
in the physical design of the pixel used. For the KAF-8300CE, the chip used
in the E-300, Kodak changed the physical architecture of the pixel so that
it provided comparable imaging performance at the smaller pixel size.
http://www.luminous-landscape.com/essays/kodak-iss.shtml
-jeff
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