I recently purchased the 30mm macro for the nex-5 and the nauticam port. So far I am enjoying the lens. While it is not the best lens for macro it is a very good for closeups. The autofocus can be a bit slow at times, but this can be common with macro lenses.
Here are some photos from Blairgowrie marina in Melbourne Australia (an awesome temperate muck diving site)

shorttail-nudi by Byron.Fowles, on Flickr

grass-clingfish by Byron.Fowles, on Flickr

flabellina_sp by Byron.Fowles, on Flickr
More photos using the macro lens:
painted-dragonet
polycera-hedgpethi
fliddler-ray
2-clingfish-and-eggs
Here are some photos from Blairgowrie marina in Melbourne Australia (an awesome temperate muck diving site)

shorttail-nudi by Byron.Fowles, on Flickr

grass-clingfish by Byron.Fowles, on Flickr

flabellina_sp by Byron.Fowles, on Flickr
More photos using the macro lens:
painted-dragonet
polycera-hedgpethi
fliddler-ray
2-clingfish-and-eggs