Fujifilm X-T50 has a Fujifilm X lens mount and currently there are 149 native lenses available for this mount.
The latest released lenses that are compatible with the X-T50 are the Meike 56mm f1.7 X, the Sigma 15mm f1.4 DC C and the Meike 23mm F1.4 APS-C.
X-T50 also has a sensor based image stabilization system that is up to 7.0-stops effective which means that all of these lenses will be stabilized when used on the X-T50.
Since Fujifilm X-T50 has a APS-C sensor, it has a focal length multiplier of 1.5x so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on X-T50.
You may also also be interested in these:
Fujifilm X-T50 Lenses with Image Stabilization
Fujifilm X-T50 Lenses with Weather Sealings