Pentax has today announced the five megapixel Optio 550 and four megapixel Optio 450. Both cameras are based on the same modern and stylish aluminium alloy case and both feature an impressive five times optical zoom lens, this places the 550 in particular into a pretty special position of having five megapixels and five times optical zoom in a compact case. Both cameras are also fully featured with a wide range of manual control and features. Storage is via SD/MMC card and the 550/450 are powered by a supplied Lithium-Ion rechargeable battery.