I do have another question - are the anti fog inserts necessary?
Also, I thought I had read somewhere that the backpack doesn't work with the scuba housing...that's not true?
If you order the backpack it comes with a larger underwater backplate to adjust for the larger size. Anti fog inserts are a must for me (diving Cozumel with high humid and 78 degree water temp). I shoot with an extendable pole from Maco and love it. I am able to extend to pole to get better shots of shy creatures.