Is the pentax hd fa 35mm f 2 good in low light?

The Pentax HD FA 35mm f/2 is a good pick for low light, mainly because f/2 lets in plenty of light. The site doesn't give a low-light rating for this lens, so I'll judge it by its aperture and the body you pair it with.

On a full-frame body, it's the best match. The sensor guide says full frame has roughly one stop of low-light advantage over APS-C, so the Pentax K-1 or the Pentax K-1 Mark II will give you the cleanest high-ISO results. On APS-C, it still works well as a fast standard prime, which the lenses guide recommends for low light and people. A solid APS-C option is the Pentax K-3 Mark III.

Written by Claude from this site's pages.