When it comes to expanding the versatility of your SP 150-600 mm DI VC USD G2 Nikon F mount lens, the Tamron 1.4x Teleconverter increases the overall focal length by a factor of up to 1.4x. It comes with a BBAR (Broad-Band Anti-Reflection) coating, which reduces flare and ghosting. The teleconverter's ergonomic design makes it easy to use. This teleconverter has a high-quality construction that makes it dust- and moisture-proof. When not required, the teleconverter can be covered with the lens caps and stored safely in the carry case provided.