Originally posted by TroopeR_ITA da*300mm will not cover FF
anyway I'm talking about used lens.. also for da*300mm
Yes it will. It has been confirmed to work on FF already. Take a look at Falk's tests.
To be honest, I would also get the DA* 300mm, although this is based entirely on the fact it is weather sealed. The F* however, is lighter and has a much nicer tripod ring (and it's cheaper). To me, the warranty doesn't really matter, since Pentax will fix the F* if anything is wrong with it (for a fee though). If, however, you don't find weather sealing important, I would justify saving yourself $300 and getting the F*. After all, it's a classic