I'm selling a never opened, never used, new in box Nauticam part 26307. This is an add on TTL converter for the Nikon D5 and D500, using Sea & Sea YS-D or Inon strobes.
List is $430. My asking price is $350, with shipping to the continental US (contact me for shipping elsewhere).
Please PM with any questions. Thanks!
More info: http://www.uwphotographyguide.com/nauticam-new-ttl-converters