I am curious to know whether Pentax thinks following symtoms (besides other obvious ones) to be problems:
1. When an SDM sitting unused for a long period, it takes long time to wake up.
2. An SDM lens is hard to lock focus at certain focal range (e.g. 50mm-70mm on 17-70mm SDM).
3. An SDM zoom can lock up at closest focus end even though you can manually move it away to make it work again.
4. AF on an SDM lens is not as accurate as screw drive lens on the same body.
I have experienced all above. By the time I realized or figured out, the lenses are already out of warranty.
This made me worried about buying another SDM lens. Buying a Pentax lens has never been so worrisome to me (I have been buying Pentax since 2000).
Last edited by hyyz; 02-10-2011 at 02:16 PM.