Here's a short video demonstration I made with the Sony FS100 showing the Blackbird stabilizer on the Steadicam Merlin arm & vest. The 'behind the scenes' footage was captured using a Sony NEX-5N.
You can mount the Blackbird stabilizer directly on the Steadicam arm and vest using the standard Merlin arm post. For this video I've used the optional Z-post (review of the Z-post) from Camera Motion Research, because it gives you more clearance between the arm and the stabilizer.
