Is the pentax k s1 good in low light?

The K-S1 has a 20.1-megapixel APS-C sensor and stabilisation built into the body, which helps when you're shooting handheld in dim rooms. I can't give you a clean high-ISO score for it. Expect it to trail full frame by about a stop at the same framing and aperture. Sensor sizes explains why.

The bigger low-light gain usually comes from fast lenses. Primes are the cheapest way to get one. From the K-S1 list, I'd start with:

• Pentax HD D FA* 50mm f/1.4 SDM AW for portraits and general use
• Pentax smc DA* 55mm f/1.4 SDM if you want a little more reach
• Sigma 35mm f/1.4 DG HSM Art for wider indoor shots and events

If you're new to primes, Lenses explains the trade-off with zooms.

Written by Claude from this site's pages.