TheSP AF 2X Pro Teleconverter for Select Nikon Lenses by Tamron features improved optical construction and is designed to be used with lenses that are f/4.0 and of focal lengths of 90mm or greater.
The 2x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300mm lens will effectively increase the focal length to 600mm. A lens set to f/2.8 will now be f/5.6.
This teleconverter is not recommended for lenses wider than 90mm, e.g. 50mm, 28-105mm, etc. However, full AF operation is still only possible with lenses with open aperture of f/4.0 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera's AF sensors. Manual focusing is recommended when using lenses with smaller open f-stop value than those given above.
This teleconverter is compatible with Nikon AF-D, AF-I and AF-S lenses. However, when using AF-D lenses, the autofocus function will only work if the camera has auto-focus capability. The current SP AF 2X Pro Teleconverters come in black only.
Note: When used with lenses with smaller maximum apertures (f/5.6, for example), there will be little difference in image quality as compared with the standard Tamron teleconverters. When used with lenses wider than 90mm, the SP teleconverters can actually compromise image quality. When using AF-D lenses the autofocus function will only work if the camera, has auto-focus capability. Tamron's 2x teleconverter is fully 100% compatible with Tamron lenses.