The new 645 28-45 is SDM, at least according to
HD Pentax-DA 645 28-45mm F4.5 ED AW SR Reviews - 645 Zoom Lenses - Pentax Lens Reviews & Lens Database
So SDM may actually be right for this lens as well.
Hopefully it is a reworked supersonic motor, not like the old SDM,
giving the kind of AF speed that the FF market will demand.
---------- Post added 09-23-15 at 10:27 PM ----------
Originally posted by rawr Both of the new big DFA zooms were ED DC AW.
But now we're waiting for the redesigned 70-200,
so it may emerge with a new version of SDM as well,
given that it's a * lens.