The AT-X 235AF PRO F/2.8 constant throughout range Internal Focus AF-D (3-D matrix distance metering)
Lens uses the latest in lens development technology, using 2 (the front and rear) molded, multicoated aspherical elements which are created through a collaboration with Hoya Corporation, the world largest manufacturer of optical glass. This lens also features the exclusive "Focus Clutch Mechanism". As with all the lenses in Tokina AT-X AF series, the AT-X 235 AF PRO is constructed using all aluminum lens barrels and a chrome plated brass mount plate. The lens elements are made of higher quality HLD (high refraction, low dispersion) glass for higher resolution and contrast.