Tokina Opera 50mm F1.4 is an Auto Focus (AF) Standard Prime lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 50mm. Providing a max aperture of f1.4 at 50mm, this lens is very fast.
Tokina Opera 50mm F1.4 is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.