With the Kenko Teleplus PRO 300 DG 2.0x AF Teleconverter full autofocus (AF) functioning is possible with lenses having a maximum aperture of f/2.8 or brighter. Having 2x magnification, the Teleplus PRO 300 is constructed of 7 multi-coated elements in 4 groups and allows a depth of field 1/2 of the prime lens used and retains the prime's minimum focusing distance.
