[Rover]

Success is far from assured for them. I can understand those who have old Pentax lenses on the shelf, hoping for a matching body... years and years on. But first of all, their number can't be very large - certainly not enough to vindicate all the R&D and other expenses - and then again, all those lenses are OLD... in the last 15 years, new competitors have sprung up and technology has evolved by leaps and bounds. I can understand that the Pentax had their own "holy trinity" - the 31, 43 and 77 lenses - but they're all dated, screw-driven and question marks of various sizes hang over each of them in the optical quality department when dense digital sensors are involved (see PZ's own reviews - the 43 was especially woeful but the 77 wasn't very thrilling either; the 31 is pretty fine but it remains to be seen how good it is on FF where all the ugly edges are shown). Meanwhile, Sigma and Tamron have made strides in their design but their newest and bestest lenses are available for most mounts... though sometimes not Pentax anymore. So Pentax/Ricoh needs to act quickly and decisively, lest they be hit with the same stick as Sony a while ago: "Not enough lenses!"