After talking to a photography friend of mine, Andrew Yu, about his Metabones Mk III and the issues he and many other photographers have had with aberrant internal reflections with the poorly flocked EF-E adapter the newer MK IV version was supposed to be an improvement. I got the IV second hand off another photographer and up until recently using it with my Canon lenses and my Sony A6000 I’ve not had any obvious issues. However the other morning, on a sunrise shoot, I decided to do some testing with the A6K using it hand held and shooting into the sun. When I got back I noticed quite a few of the images had an unusual flare pattern on the images I had not seen before.
Andrew had given me some adhesive flocking paper http://www.firstlightoptics.com/misc/black-velour-telescope-flocking-material.html but the flocking template he had used was for the Mk III. I scoured the internet and found a post by Marc Aurel who had also made a Mk IV template and guide here: http://forum.luminous-landscape.com/index.php?topic=97089.0.
He uploaded a template which I have reproduced here but for the full sized template you will have to become a member of the Luminous Landscape forums. The template printed at 100% is a perfect scale for a template to cut out the flocking paper.
It was fairly easy to cut out the shapes and put them in place. However the white backing of the flocking paper can be seen at the edges so I used a permanent black marker to colour any white paper edges which were exposed.