Re: Opinions wanted -> couple lenses

[Jim King]

I don't have any experience with the Sigma but I have both Pentax  
lenses and shoot with them on my D.  IMO the 28mm is a good lens and  
the 20mm is a very good lens - Joe Tainter has also commented on its  
good performance.  if you can get these at a reasonable price you  
won't be disappointed.

Regards, Jim