for 250-300 bucks you can get the sony macro lens for nex system. its f-stop 3.5 until 16 and is very light and well build.
the close distance is 2-3 cm and the lens give very nice bokey. lens itss pretty sharp, specially for the price. the autofocus is fast.
Exceptionally portable and versatile for everyday use. its not the fastet lens with F3.5, but otherwise there are no complains. a great lens ! its very shot review but there is nothing tell except the technical details which you can view on the web anyway.
click images to see full size:
a example how autofocus system works in video –> look here
more example pictures:
for more examples look here