I have a personal theory about this I don't know how far fetched it is but I WANT to believe that Pentax' FF system will be DFA* only. That meaning a full range of lenses (zooms and primes) probably 12 tops build from the scratch and 3-4 improved designs in order to defeat any rival in the FF field at price/performance ratio. I imagine that this lenses will appeal to APS-C owners too but they will have to pay a premium compared to DA*s. More than that I suppose some focal lenghts will not be doubled up with FF and APS-C lenses (85, >400). And the Limiteds could be an APS-C alternative lacking SDM, ws and 1 stop of "speed" e.g. a small DA 135/3.5 Ltd. After all if Pentax could launch 10 APS-C new lenses this year for the next will have only minor holes to fill up in primes especially. And finally a totaly new range of lenses with today's design and coatings will blow away older designs from others in performance the only unknown being their prices. But if we look at current prices for 31 Ltd and 43 Ltd I guess we're in pretty good shape
Logical for me it would be this kind of FF setup:
Zooms:
24-70/2.8, 70-200/2.8, 150-400/4
Primes:
20/2.8, 31/1.8 (reloaded
), 43/1.9 (reloaded
), 50/2.8 Macro (reloaded
), 85/1.4, 100/2.8 (new design), 135/2.x, 150(180)/2.8 macro, 200/2.8 (maybe a ring motor version of curent DA* which will be retired), 300/2.8, 400/4, 600/5.6.
Total: 15 lenses to appear in 2 years (3 only improved and I guess the 600 it's in limited production). If they could make at least 2 zooms and 2-3 primes until the launch of Pentax FF and redo the 3 left from the recent past in a year's time we could have a pretty spectacular FF K mount system.
To me that seems a nice plan to fight Canon and Nikon who have older lenses and Sony with even older and fewer ones. And with the advent of the ~25 Mp sensors believe me the IQ will be even more dependent of lens quality than ever before.
Radu
P.S. *Reloaded* means up to date coatings if necessary, wheather sealing and SDM (pls ring motors, Pentax)