The craziest lens in the world and a fascinating technique

http://www.google.co.uk/search?sourceid=chrome&ie=UTF-8&q=Canon+65mm+MPE
<http://www.google.co.uk/search?sourceid=chrome&ie=UTF-8&q=Canon+65mm+MPE>

The Canon MP-E 65mm.

It takes amazing photos though.
http://www.flickr.com/groups/14414927@N00/pool/

The depth of field can be extremely small but using a technique called
focus stacking several frames can be integrated together to create a
wide depth of field at very close focusing distances.

These are examples of photos done using focus stacking.
http://www.cognisys-inc.com/more_photos/photo_gallery.php?osCsid=4f544ea4bdaf51cfb9c4e1d54f82ec1c

http://zerenesystems.com/stacker/docs/ImageGallery.php