Succeeding in the D-SLR market is no piece of cake. Ask Sony. The duopoly of Canon and Nikon is so well established that other manufacturers do not even get a look in. The only way to pierce such a market is by being radically different. Olympus invented the new Four Thirds mount but lost their way thereafter producing bulky, big cameras until a rude wake-up call made them sit up and change. Sony was busy trying to pick up the ruins of Minolta; its SLRs have treaded the beaten path. Pentax was too small, anyway, to matter.