After some browsing and with abdominal pain due to the driven by the camera autofocus I then bought the Tamron. And - bingo!
At the K5 the AF is not a problem, provided one accepts what can be offered for the price
At the K5 autofocus 3200-12800 NO defocus sits quite well (a little "game", sometimes a little (not much) before or after it. In a relatively dark gymnasium at f / 4 and ISO at about 120 shots. With the AF fast enough, but I have no long jump or sprint photographed, but TT and a children's theater.
The autofocus is audible presence, I think he's not annoying. It is, however, surprised at how quiet after that an ultrasound drive.
The feel is good, not outstanding.
The image quality is outstanding, even at full aperture knows how to convince the lens. I need to limit, however, that I have so far used only in cloudy weather in the late fall and indoors.
There is a bag supplied (the bear, however, neither over the shoulder, still attached to the belt leaves) and a huge sun visor.
4 points because
the feel could be better
switching to MF when Pentax again presupposes a double switch
I would like to have an HSM anyway
I am very pleased overall.
Very unfortunate that Tamron brings no new lenses for Pentax more on the market. The 2.0 / 60 would be high on the wish list.
A.