Tamron 45mm F1.8 Di VC USD 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 45mm. Providing a max aperture of f1.8 at 45mm, this lens is very fast.
This lens features on optical image stabilization which helps capturing sharper images at lower shutter speeds. Tamron 45mm F1.8 Di VC USD is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.