WILL THIS LENS WORK ON THE NEX 7. HOW DOES IT PERFORM AS A MACRO LENS?
I use the Sonnar 55/1.8 on a Sony A7R and I don't know if it will work on a NEX 7. Sorry. I assume it will but you need to check with someone who knows Sony mounts and the use of this lens on the NEX bodies.
It will focus down to about 20 inches but I would not consider it to be a macro-capable lens. But with the 9 blade aperture and wide open, one gets terrific bokeh effects so that it certainly conveys a sense of macro images when shooting in its close-up range. I have a Canon FD macro 100mm lens that I use for macro with the A7R so I seldom try to get into the macro realm with the 55/1.8 lens.