Pentax finished Monday with a unique take on the rapidly growing compact ultrazoom camera field. Its Optio RZ18 fits an 18X zoom 25-450mm equivalent lens with an f3.5-4.9 aperture into a consciously minimal design that stays relatively thin. A 16-megapixel sensor puts it at the higher end of the range, and it has an unusually wide ISO 80 to 6,400 sensitivty range for the class.
