You asked
What is the pentax hd d fa 24 70mm f 2 8 ed sdm wr good for?
The Pentax HD D FA 24-70mm f/2.8 is a good everyday workhorse. On full frame it covers standard wide to short telephoto, which handles most scenes: people, travel, street, and general walkaround shooting. Its constant f/2.8 aperture means the exposure stays the same across the whole zoom, and it gives you faster shutter speeds indoors and nicer background blur.
It's not stabilised, so lean on a fast shutter speed or a stabilised body. It's built for full frame, but it also fits the APS-C bodies, where it acts like a 36-105mm. For a first serious lens, see Lenses, and for scenery, Landscape.
Written by Claude from this site's pages.