Following Casio’s lead, which just upped its superslim Exilim EX-Z3 digital camera from three to four megapixels, Pentax has bumped up the resolution of its Optio S (which uses the same lens and imaging sensor as the Exilim), to four megapixels. Other than the increase in megapixels, the Optios S4 is exactly the same as its predecessor, and has the same casing, weight, and 3x optical zoom lens as the Optio S.
