What lenses do you already have? That information would make offering advice a lot easier.
Of the DA limiteds, the 21 is firming as my favourite. The field of view is just right for general walk-around use. It is tiny, sharp, close focussing and renders colours beautifully.
The 15 is more of a specialty lens, but creates dramatic images and is just about the most flare-resistant lens around.
The 40 and 70 are excellent optically, but they didn't produce the same magic for me that the FA43 and FA77 do. I sold both recently as they were always bridesmaids to those great lenses. I also found the 40 a little *too* small for easy handling.
As for the FA limiteds, what can I say? If I had to spend the rest of my life with only one lens it would be the FA31; it provides a widish normal angle of view on APS-C and is sharp, fast, relatively compact for what it offers, has sublime bokeh and is a tactile delight.
The FA77 would be my second choice; its focal length is a little less versatile, but it's razor sharp even wide open, has paper-thin DOF if you need it, produces even better bokeh than the 31 and it's the prettiest lens Pentax makes. It renders the human face like no other.
It takes more time and effort to master he FA43; the bokeh can be a bit funky at times, especially with high contrast backgrounds, but when you get it right there is more pixie dust per cc in this little gem than any other.
Enjoy your journey. Try stopping at just one!
Last edited by Sandy Hancock; 07-12-2013 at 05:03 PM.