Canon makes two teleconverters for the RF mount:
- 1.4x — 7 elements in 4 groups. Weight 7.9 ounces (225g). Works with 1100-500mm f/4.5-7.1, 600mm f/11, 800mm f/11
- 2x — 9 elements in 5 groups. Weight 12.4 ounces (350g). Works with 100-400mm f/5.6-8, 100-500mm f/4.5-7.1, 400mm f/2.8L, 600mm f/4L, 600mm f/11, 800mm f/11