Here is an example of a self made adapter:

Stage6 · a trysting place*-*Video and Download*·*fss328

You might not understand the short film but you can look at his other music videos.

The point is that you don't need alot of money to buy one if you know how to build one yourself. He build it with the Redrock DIY plans and use a SGpro Achromat. Also with an good lighting and good lens is needed.

The Redrock plans are quite similier to this one here:

DOF depth of field using 35mm lenses