Make sure your camera has an AF motor built in (higher end Nikons, such as D7000, D7100, any FX camera) otherwise the lens will be completely manual. Also remember if you have a DX sensor, your lens won't be f/1.8 @ 50mm, but something like f/2.7 @ 75mm.
Very fast lens Bokeh is great Very inexpensive Works on FX and DX sensors Fast focus
No internal AF motor; so you need a camera that has a AF motor or be okay with manual focus Does not come with lens hood Focusing is loud