It is weather-resistant (WR), meaning it is sealed against dust and moisture, but it is not fully waterproof and should not be submerged.
No, it does not have built-in Optical Image Stabilization. It relies on the In-Body Image Stabilization (IBIS) of cameras like the Fujifilm X-T4, X-T5, or X-H2.
With a 76mm equivalent field of view, it is perfect for portraits, headshots, and street photography where you need a slight telephoto compression.