Yes, it features a dust and moisture-resistant design, along with a fluorine coating on the front element to repel water and oil.
Yes, it is fully compatible with Sony's 1.4x (SEL14TC) and 2.0x (SEL20TC) teleconverters, extending the reach up to 400mm.
The lens features built-in image stabilization with three modes, including Mode 3 for framing stability when tracking fast-moving subjects.