Pocket-Lint: Pentax’s plain yet not unattractive Optio M900 pocket compact has an asking price of a mere £100 - so it can’t be all that much cop, can it? Our thoughts exactly - and yet the camera surprised us, up to a point, from the minute we eased it from its box and clasped it in our palm, its black or burgundy body barely wider and no longer than the average phone handset.