Well folks... I did purchase the HF-10/Ikelite set-up because it was within my budget and used it on my trip to Indonesia. While I did get some fantastic video clips over 54 dives, I also experienced fogging--but just on the lense, not the inside of the entire housing--around the last 15 minutes of many, many dives--despite making sure the driest, coolest air was trapped inside the housing. What I noticed is that lense fogging happened most often when the camera was used more during a dive. When removing the camera from the housing after a "fogged" dive, I noticed the camera heats up significantly the more video I shot on a dive. I'm speculating that a hot camera heats the cool air inside the housing. That air then condenses on the cool lense. I had to shut the camera off between every clip to minimize the operating temperature. While hesitant to mess with the housing lense, I did experiment with using an anti-fogging gel used inside masks and that seemed to help a bit.