Sony E 70-350mm F4.5-6.3 G OSS is an Auto Focus (AF) Telephoto Zoom lens with APS-C / DX max sensor coverage. When mounted on a APS-C / DX sensor camera, it will give you an FF equivalent focal range of 105 - 525mm. With the max apertures of only f4.5 at 70mm, and f6.3 at 350mm, the lens is quite slow at both ends.
This lens features on optical image stabilization which helps capturing sharper images at lower shutter speeds. Sony E 70-350mm F4.5-6.3 G OSS is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.