NIKON D4 MANUAL
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Using Teleconverters | Nikon
The answer to that depends upon which Nikon DSLR body you’re shooting with. Up until the introduction of the D4, if you used a teleconverter with a NIKKOR lens, you’d lose autofocus capabilities at apertures smaller than f/5.6, be required to use a slow shutter speed or increase the ISO since a fast aperture wasn't possible.
Nikon D7000 - Wikipedia
The Nikon D7000 is a 16.2-megapixel digital single-lens reflex camera (DSLR) model announced by Nikon on September 15, 2010. It replaced the D90 as the top end consumer camera, but using much of the technology and controls from the earlier D5000, in a larger more robust body similar to the flagship D300 series. In some ways it was superior to the D300S, though for several
Nikon D40 - Wikipedia
The Nikon D40 is Nikon F-mount entry-level digital SLR, announced November 16, 2006 and made until March 2009, when it was succeeded by the Nikon D3000. Compared to its predecessor, the D50, the D40 had several features removed, a few added, and a lower price: US$499 ESP as of November 2009 with the 18–55 mm G-II kit lens, positioning it as an