The AF-I 600mm F4D ED lens is a super-telephoto lens made in Japan (1990s vintage). The AF-I series Nikkor lenses has a built-in DC motor and a distance chip which made it focuses faster than normal AF Nikkor lenses and provides a more sophisticated 3rd generation Matrix Metering system found on newer series of Nikon AF DSLRs.
The 600mm AF-I has a 9 elements in 7 groups design and improved the lens close focusing capability to a closer 19.7 ft. It has four times the magnifications of the 300mm and so do with magnification of even slight movement during shooting. With this type of lens, you definitely would require a monopod/tripod or any other form of steady support.
In very good condition, with original case and twin hoods.
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