Originally posted by Mo Star lenses have always been a notch or two above all the others, and I hope that Pentax doesn't disappoint us with their new DA* series. Sadly, I have a feeling that star lenses now aren't what they used to be 10+ years ago, but let's hope I'm wrong...
The DA* 55mm will probably be a bit bigger than the FA, and the build quality will probably the the same, but it's the IQ that counts. I think Pentax will work on improving it...
BTW, if you want a sharper 50mm lens and you don't want to wait, try out the FA 50/1.7!
If you don't mind the loss of 2 stops, then the F/FA 50 f2.8 macro (and also the D-FA if you want quick shift) are sharper than either of the two other 50's at f2.8 upwards, they also have less distortion, CA and better contrast and, IMO, even better bokeh.
Okay, they are more costly, but you have the added benefit of one of the best macro lens designs, they also work extremely well with a Tamron 1.4x TC to give you a 70mm f4 macro, just that bit of extra reach for those bug shots! If you have the luxury of a 100mm macro as well then you can get a very nice 140mm f4.0!
I've rarely found the need for anything faster than f2.8, especially now with SR on both the K-D bodies. The very shallow DOF of less than f2.8 at 50mm, I actually find more of a hinderance than help, but I know that others love the effect.