Best telephoto lens for the pentax k 5?

For the K-5, I'd start with the **Pentax HD D FA* 70-200mm f/2.8 ED DC AW**. On the K-5's APS-C sensor it frames like 105-300mm, and the f/2.8 aperture is the one to pick if you shoot in dim light or want a blurry background.

If you need more reach for distant birds or wildlife, look at the Pentax HD D FA 150-450mm f/4.5-5.6 ED DC AW, which frames like 225-675mm. It is slower, so you'll need more light.

For a lighter middle option, the **[Pentax smc DA* 60-250mm f/4 ED [IF] SDM](/gear/lenses/pentax-smc-da-60-250mm-f-4-ed-if-sdm/)** covers 90-375mm equivalent at a steady f/4.

For more on what to look for, see wildlife and sport.

Written by Claude from this site's pages.