ok so it seems like a lens problem. I will return my lens then, hope the next copy will be just as sharp

Hi I do have exactly the same problem with the 40mm DA on the K5. Both are new.
If focusing at infinity, the AF will not confirm and not release.
Sometimes after waiting for a while the shutter finally fires.

I also have the 70mm and the 21mm. In exact the same situation the 70mm will work fine. The 21mm sometimes also "hesitates" a bit but then releases.

Now I don't know if its the camera or the lens problem.

Did you guys find out something?

Besides that the 40mm and 21mm ar both super sharp and contrasty. specially the 40mm. and the bokeh from 40mm is great. the 70mm is overhyped on the reviews compared to the 40mm, which doesn't always get the best reviews.

I m coming from nikon d700 with 85mm 1.4g and 35mm 1.4g, so I know what Im talking about Nikon has great quality and in low light the images are superior as well as the AF is more intelligent. I like the color from Pentax though and the sharpness - which can result in nice clear pics.