Pentax smc DA 50-200mm f/4-5.6 ED Lens

I am enjoying using the lens. It works well on the K10D and has the same filter thread as the 18-55mm kit lens which means interchangeable filters. Only criticisms are that the lens hood is a bit "cheap" in design and fixing, it can be put on wrong and is then fiddly to remove, and the lens didn't come with a soft case.

The lense is a very good value for money. It's got some quirks, like trouble focusing undefined objects (like tree cups) at the 200mm range, but other than that, it's a good buy.

If you're trying to shoot birds, for example, you won't be disappointed, even at the 200mm range.

If you don't have a tripod for those zoom photos, you might benefit from a shake control system on the camera, since the lense doesn't include one.

Finally, the color of the photos taken with the lense surprised me, because they're actually very good. Very vibrant colors.