How do I keep the water from gathering on my lens port, I do not want to just start trying stuff, being afraid of ruining the housing. I seem to ket water droplets right in the wrong places.... Any suggestions???
Here's my spit technique **for surf housings**, it works perfectly. I rarely get water drops in my shots. For wide shots (in the impact zone): about 5 seconds before the wave is on me, I spit on the port. I might **gently** spread it around with my finger (no rough gloves). I dip it, pull it out and now I have a perfect thin sheet of water on the dome, it is effectively part of the optics. It will remain intact for about 10 seconds or so, throughout the entire sequence until I am underwater again.
The key is keeping that thin sheet of water intact. After a while -- especially if it is windy -- it tears apart and you have the classic "water droplet on dome port" problem. Using just plain sea water doesn't work nearly as well, it is the spit then the quick rinse that creates the thin sheet. Eating fries was recommended to me, something about the sugars in your saliva having a beneficial effect on the surface tension and holding that thin sheet on the dome intact. So I make sure to down a supersize box of fries before every session.
For telephoto shots with a 70-200 through a flat port, I carry a tiny squeegee on a necklace. I will first lick the squeegee to get any salt and sand off it the blad, then spit on the port, rinse it, and then **gently** squeegee it with a tiny squeegee. If there is any streaking, I repeat the process. Once I have the flat port streak free and dry, I keep the port dry as long as possible by floating the housing in the water with the port pointed up in the air (not toward the sun), which is not hard to do if you are outside the impact zone on in a channel. Once it gets spots from spray or some grom buzzing me, or it gets dunked, I will spit, rinse and squeegee again.
Two techniques depending on whether in the surf or shooting from a channel. I don't have any experience with waxes or applying anything other than spit to the ports.
Cheers, Phil