Just like with any 2x teleconverter, the focal length of the attached lens is doubled, with a consequent aperture reduction of two f/stops. As such, a 70-200mm f/2.8 zoom effectively becomes roughly a ...

Intro 2020 announces details and availability of the new Kenko TELEPLUS HD pro series of teleconverters. The TELEPLUS HD pro series replaces the previous TELEPLUS PRO300 series, with redesigned optics ...