Best telephoto lens for the pentax k s2?

For the K-S2, I'd start with the Pentax HD D FA 150-450mm f/4.5-5.6 ED DC AW. It gives about 225-675mm equivalent on full frame, so it has the most reach for distant birds and wildlife. The trade-off is that it's slow at the long end.

If you want more light, the **[Pentax smc DA* 60-250mm f/4 ED \[IF\] SDM](/gear/lenses/pentax-smc-da-60-250mm-f-4-ed-if-sdm/)** is a good all-round pick. It's around 90-375mm equivalent and stays at f/4 through its range, which helps for sport and indoor events.

For the fastest option, look at the **Pentax HD D FA\* 70-200mm f/2.8 ED DC AW**. It's about 105-300mm equivalent and f/2.8 across its zoom range, so it's the choice for low light, though it reaches less far than the 150-450mm.

On a 1.5x crop body, you need longer focal lengths than full-frame guides suggest. The wildlife and sport guide covers how much reach you need for different subjects.

Written by Claude from this site's pages.