Is the fujifilm mkx 18 55mm t2 9 good for portraits?

It's not a great choice for portraits. It's a manual-focus cinema zoom with no autofocus and no stabilisation, and at f/2.9 it gives roughly the depth of field of f/4.3 on APS-C. That means less background blur than you'd want for a portrait. The 27-82mm full-frame equivalent is a usable framing range at the long end, so it can work for a patient, deliberate session where you focus by hand.

The site's Portraits page says the lens matters more than the camera, and that window light will do more than any gear. For a portrait lens, the first lenses guide suggests a fast standard prime, around 33-35mm on APS-C, or an 85mm for head-and-shoulders work. Check the lens page for the mount and specs before you buy anything.

Written by Claude from this site's pages.