What do the abbreviations on a Tokina lens mean?
AF stands for autofocus. That means the lens can focus automatically. This is a general abbreviation in photography.
The abbreviation AT-X means Advanced Technology Extra. You'll find this on all Tokina lenses with special types of glass.
Digital or DX lenses are only suitable for digital cameras with an APS-C sensor.
FX refers to a full-frame sensor. Lenses with this format are optimized for full-frame cameras, but can also be used on an APS-C camera.
Manual Focus is the lens setting that allows you to focus manually. Like AF, this is a general abbreviation.
NH stands for No Hood. The lens doesn't have a built-in lens hood, which allows for a wider image.
Focus Clutch Mechanism is a system that allows you to quickly switch between autofocus and manual focus.
This stands for Super Low Dispersion. Low-dispersion lens elements reduce chromatic aberration, which is a kind of purple fringing that occurs with very high contrast along sharp edges.
Lenses with VCM-S have image stabilization and an ultrasonic autofocus motor. The image stabilization compensates shaking of the hand and the ultrasonic autofocus motor focuses silently and quickly.