Hi!
Setting aside the distinctions between DA, D-FA, FA, F, A, M, and basic K lenses, I wanted to discuss focal lengths for the *ist-DS.
I've got my zoom kit pretty much where I want it for now: SMC Pentax-DA 16-45mm f/4 ED AL SMC Pentax-FA 28-105mm f/3.2-4.5 IF AL SMC Pentax-FA 80-320mm f/4.5-5.6
Now I'm working on building my fixed focal length kit. Currently it consists only of the SMC Pentax-FA 50mm f/1.4.
I love that lens; its focal length is great as a mild telephoto, very nice for portraits. And its so small, yields a bright viewfinder, and offers fast optics. Imagine buying an f/1.4 telephoto lens this size for a 35mm camera!
That leaves me with some holes though: Wide, Standard, and longer telephoto.
Dave, if I may, a wild suggestion here it comes.
All your lenses are FA. Therefore each of your shots contains the exact focal length recorded in EXIF data. So perhaps you could simply shoot some and then collect statistics of what focal lengths you actually use.
Then guided by the actual data, you can go and buy primes of your liking.
Just my cents.
Boris
