Super-Telephoto, Super Versatile
Combining reach, speed, and versatility, the NIKKOR Z 600mm f/4 TC VR S, from Nikon is a super-telephoto prime built for the rigors of sports and wildlife photography. Characterized by its long focal length and bright f/4 design, along with speedy AF and robust VR, this lens further distinguishes itself with a built-in 1.4x teleconverter that permits near-instant switching to an effective 840mm f/5.6 for even greater reach when needed.
 
Built-in 1.4x teleconverter allows you to instantly extend your reach to 840mm simply by flipping the right-hand switch.
Since the teleconverter is integrated within the lens housing, it is optically matched to the lens for improved imaging performance and also fully maintains the lens's weather sealing.
Integrated design also reduces the likelihood of attracting dust or dirt to optical or sensor services and saves time when changing between focal lengths.
When the teleconverter is in use, this 600mm f/4 becomes an effective 840mm f/5.6 lens