Overall, this is a poor performance even for an inexpensive kit lens. If you're interested in purchasing the Pentax K-5 with the kit lens, make sure to buy from a retailer that allows hassle-free returns and test the lens thoroughly within the exchange period.
Latest rumor wave created by a senior member of Pentax Forums, According to him Pentax will soon announce a new fullframe DSLR camera loaded with recently announced Sony A7R II Sensor, the other important information shared by him that Tamron will be adding new Pentax K mount lenses to its lens database soon…
As mentioned previously, the Pentax K-5 is usually sold body-only, or bundled with the Pentax 18-55mm f/3.5-5.6 AL WR kit lens. WR stands for "Weather Resistant", which is also true of the K-5 body. The Pentax 18-55mm WR lens offers a typical optical zoom range of ~3.1x for an inexpensive kit lens. Sharpness is fairly good across the frame at full wide-angle (stopped down to f/8), with low levels of coma distortion, but some strong chromatic aberration is visible in the corners. Results at full telephoto are quite soft particularly in the top-right, but with much lower levels of chromatic aberration. (Note: The non-WR "AL II" version of this lens performed quite well with the K-5, so we requested a second sample of WR lens for testing, thinking our first was one was defective. Unfortunately, the second copy was no better.)
As mentioned previously, the Pentax K-r is sold body-only or bundled with the Pentax 18-55mm f/3.5-5.6 D AL kit lens. The Pentax 18-55mm lens offers a typical optical zoom range of ~3.1x for an inexpensive kit lens. Sharpness was fairly good across the frame at full wide-angle (stopped down to f/8), with low levels of coma distortion, but strong chromatic aberration as well as some minor softening was visible in the corners. Results at full telephoto were fair with sharp detail on the right side of the frame and much lower levels of chromatic aberration, but the bottom left quadrant of the frame was a little soft.