But this Retro Adapter is a high quality finish and do what he should.
For a few bucks you can here, for example making its normal 18-55 kit lens to small macro.
Clearly it can not then with true macro lenses but keep in any case one can deal so closer to the macro photography, before going any buys an expensive macro and then you realize that it's not for you.
Of course, the autofocus function is not working. due to design it is no different when the lens is also upside down sitting on the body.
So manual focus is called for, as with all other adapters also retro.
But for the price it's really a great thing that you can still try it.