Originally posted by RyanGilbert I am in the market for a Prime lens for my K-5, mostly for landscape and portrait. As far as the Limited series goes, which one is the best?
'Mostly for landscape and portrait'? While you can use any lens for anything, these are two very different usages.
Bear in mind that you don't really need AF for landscapes - they tend to be fairly static, and and you will probably be stopped down a good bit. Other people have mentioned the FA31 as a candidate, and if I could afford one I would buy one; but for landscapes, something like the K28/3.5 is much much cheaper, is easy to use, and will produce comparable results.
'Landscape' does not equate with 'wide angle', but if you wanted wider, DA21 is my choice. I think the DA15 is quite a specialist lens, not suitable for every situation.
Others have suggested good portrait options. An FA50 (either 1.4 or 1.7) would do the job, as it's a mild telephoto on APS-C and gives nice blurry bits wide open.