NEX 5N adapters
I have a FD-NEX adapter (FD-film lenses) and one EOS-NEX adapter. These two works great on my NEX-5...you can buy these like $20-$50 on eBay. But, you can only use these adapters to manual focusing. I am not sure if there's an available adapters like one in sony for alpha lenses.
If you want to buy these adapters, buy also a viewfinder for your 5n so you could focus it 99.9% clear. And if you have EOS lenses I can sell mine(EOS-NEX adapter) to you. Am just fond using my FD lenses and not using it anymore
"imagination is the key"