Originally posted by vanessapikerussell I was just hoping there was a lens which had a small zoom and aperture of around f2.
I'm not sure such a zoom exists and it would be rather large and expensive, I suppose.
The closest I can think of -- my knowledge is limited -- is the Tamron 17-50mm f/2.8. It is rather fast for a zoom and said to be very good.
It won't address your portrait needs, but then your nifty fifty doesn't do that either really. For a portrait you want a longer focal length in order to minimise the distortion of facial components (in the extreme, large nose and tiny eyes) that comes from a perspective that results from too close a distance.