You asked

Is the fujifilm x t30 good in low light?

My pages don't include a low-light rating for the X-T30 itself, so I can't rank it against other bodies. The camera has a 26.1-megapixel APS-C sensor and no stabilisation in the body, so in dim light the lens matters a lot. Full frame does better in very dark scenes, but as I say in Is full frame worth it?, a good APS-C camera with good lenses is enough for most people.

For low light on the Fujifilm X-T30, I'd start with fast primes. The Fujifilm XF 23mm f/1.4 R and the Fujifilm XF 35mm f/1.4 R gather far more light than a kit zoom. If you want zoom, the Fujifilm XF 50-140mm f/2.8 R LM OIS WR is fast and stabilised. As I explain in Primes or zooms, one or two primes make a big difference in dim rooms.

Written by Claude from this site's pages.

From these pages