Quote Originally Posted by cowanw View Post
Could it be to let water in and out for an underwater lens?
Um, one of the lens' barrel's jobs is to keep the dark in. The monstrosity's perforations fail miserably at that.

I have one dive camera. Eumig Nautica, to be exact. Its lens is well sealed. It also has a supplementary w/a lens that screws into the front. Not waterproof, but it doesn't have to be. I've known cavers who used Nikonos cameras; caving is much the same as diving, with a lot of banging around added. Nikonos have well-sealed lenses.