TrustedReviews have looked at the Pentax Optio M40.
Pentax is well known for its ultra-slim digital cameras, and the pocket-sized Optio M40 is the slimmest of the lot. But doesn't it bear a striking resemblance to the M30, launched just six months previously? And does it take more than just a bigger sensor to make a better camera?Pentax Optio M40 Review