5N and poor man's macro

Maybe all of you ignore the NEX mounte reverse adapter, which does exactly the same thing, costs 10 bucks, and is on ebay since one year ago..

http://www.ebay.com/itm/49mm-reverse-macro-adapter-for-SONY-NEX-5-NEX-3-NEX-5-3-/140454192515?pt=LH_DefaultDomain_0&hash=item20b3b8e583

I used it for some fun tests, and it works pretty well, but.. focus range gets really short, like a couple of millimiters.