Good to know- With this all-round G lens, you can go all the way from ultra-wide to portrait focal lengths while keeping it wide open- The constant f/2.8 aperture produces beautiful bokeh for portraiture, outstanding vlogs and adding depth to your landscape shots- It uses advanced aspherical lenses, ED glass, and a Nano AR coating to give you flawless images that are sharp from corner to corner- The XD linear focus motor takes care of fast and precise subject tracking and smooth cinematic transitions- You can assign a custom function to the focus hold button, making it easier to nail the focus or get the exposure just right- The dust and moisture resistant design with fluorine coating means no specks or raindrops will find their way into the optics