The MEGA is a moderate-volume mask, but aren low volume masks better?
A Traditionally, there’s been three reasons why flat-mask designers pursued low volume masks: Wider View: Moving flat windows closer to your eyes, you’ll get a very slight increase in view angle… but the very widest flat mask yields a small 71° wide view underwater; most flat masks deliver less than 65°. Look at underwater photos of divers wearing flat masks; as they angle their head away from the camera, the surface of their mask turns into a mirror — if you can t see in, they can t see out. A related phenomenon — when you re underwater looking up, you can only see sky through a 95.5° cone. At greater angles, the undersurface of the water acts like a mirror, reflecting back the bottom. Optical engineers call this T.I.R. (Total Internal Reflection). Easier Clearing: For some new divers, learning to clear a flooded mask can be a challenge. All things being equal, a low-volume flat mask is easier to clear than large-volume masks, because you’re displacing less water. But HydroOptix h
