Currently there are 8 native Telephoto Zoom lenses for Fujifilm X-T1 IR and 7 of these lenses are autofocus (AF) type.
Fujifilm X-T1 IR doesn't have a sensor based image stabilization system but 7 of these Telephoto Zoom lenses features optical image stabilization.
Since Fujifilm X-T1 IR has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 5 Telephoto Zoom lenses with Weather Sealings.