Tamron AF20C-700 AF 2X Teleconverter for Canon EOS Mount. Teleconverters, either 1.4X or 2X, are efficient tools to add focal length to the
photographer's arsenal. The 2X doubles the focal length of the master lens and makes the lens two f-stops slower. In addition to increasing focal length, this teleconverter allows greater magnification in macro since the Minimum Object Distance (MOD) of the master lens does not change when used with the teleconverters. AF will be retained with the 2X teleconverter if the master lens is F/4.0 or faster.
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Reviewed by Gene Wright on