Ah Nick H....so you noticed the pole came;) All I can say is "where has it been all my life"! I have a full write up with pics and instructions coming this week on that...it is super cool.
Also, the .3M is rock solid close and far. Main reason is because that is how your lens will auto focus most of the time. In very clear bright and shallow conditions, it can come up with numbers like .4M to .6M and even 1M. But .3M does trick 90% of the time. The fish can swim from 10 meters away right to your lens and stay in focus the whole way. Also, you never get that focus hunting that destroys shots. Almost all my wide shooting is done at .3M.
(note, every wide lens has its own focal distance...so .3m is not a magic number for the universe of lens)