This is the standard kit lens for any number of modern Pentax DSLR bodies. This lens is a fully automatic lens. I've seen them on Ebay for $40 to $80 rather consistently. With a zoom range of 18-55mm you'll be able to use this for most everyday shooting.
PROS:
+It's Cheap: There are plenty. And if one didn't come with your body, It would be easy to acquire.
+It's light: This lens won't hurt your neck if you keep it on your camera all day long.
+Reasonably sharp: For a kit zoom lens, it's not bad. I's sharper than some of my off-brand primes.
+Quick AF: While not astoundingly fast, this lens does auto-focus quickly.
CONS:
-Lots of barrel distortion at 18mm: You'll find yourself straightening horizons from your vacation with this lens at 18mm.
-It's cold: This lens is pretty cold. Noticeably so.-Loud AF: So the next time your trying to be quite with your camera and you half press the shutter release, everyone will notice you.
MISCONCEPTIONS:
So there might actually be a couple of misconceptions about this lens so here goes!
1. It's a kit zoom, like those 80's one's: This lens is SO much better than those 80's zooms in all respects.
My Take:
It came with my camera, and if I'm just carrying one around to shoot my family or friends, this is the one I take.