Originally posted by OniFactor i'd take a cheap high quality f4 over high priced 2.8, but that's me. hopefully these will be backwards compatible, but i'm not sure if they will be.. also, the 17-70 should be a DA* as well.. hrrm.
The Tamron 17-50/2.8 is exactly a f/2.8, cheap AND compatible lens (not a Sigma I mean...)
And the 17-70 is replacing the 16-45 so I do not see why the should make it a DA*.
DA* are supposed the be the cream of the best lenses. I do not expect a 17-70 to be that although it'd better be very good.
That being said, I do not like much the construction of that 17-70 (and 16-45 for that matter). I'd prefer DA*-like or DA14-like. I mean how the focussing system works and shows markings...
We don't even know if that 17-70 will be pre-K10D compatible (on AF pov).