Nikon AF-S 1.7x TC-17E II

Main Features

• Mount Type: Nikon F-Bayonet
• Optical Conversion Factor: 1.7x, Effectively increases the focal length of the attached lens by 70%
• Compatible Format(s): FX, DX, FX in DX Crop Mode, 35mm Film
• Autofocus: Yes
• Approx. Dimensions (Diameter x Length): 2.6 in.x1.2 in.
• Approx. Weight: 8.8 oz.250 g
• Lens Type: Teleconverter

 Converters are designed to be used on longer focal length lenses. Prime lenses under about 100mm, zooms shorter than about 70-200mm, and “superzooms” like an 18-200mm, tend to give poorer results with converters.

A 1.7x converter will lose 1.5 stops of light; an f/2.8 lens becomes an f/4.7 combination

Nikon TC-17E II is compatible with Nikkor AF-S & AF-I Lenses.  Autofocus is possible with lenses having a maximum aperture of f/4 or greater (f/5.6 for the D800 and newer cameras)
Autofocus may be possible in some conditions with lenses having a smaller maximum aperture.

Sigma lenses and converters are the trickiest for compatibility – in general, Sigma lenses only work reliably with Sigma converters and vice-versa.

Suggested lenses would be Nikon AF-S 70-200mm f2.8 or AF-S 300mm F2.8 for best results.