Hi, I was wondering if I have to "pre-treat the mask lens" to remove the residue so the lens wont fog up?
Hello, you always need to pretreat the mask yourself either with tooth past or mask scrub. http://www.scuba.com/scuba-gear-54/030981/500psi-Scuba-Dive-Mask-Scrub.html
Visibility is the most important aspect of any dive. The new M3 mask provides that with distortion free vision and superior fit. This low profile design uses a rigid frame and two lenses with an extra clear glass which is valued for its attractive appearance and optical qualities. The low iron content produces a higher light transmittance and a reduced green tint inherent in other glasses. This makes the lens distortion free and helps improve color and visibility in low light conditions underwater.
Frameless 100% pure silicon skirt
Saint-Gobain Diamant - Crystal Clear Lenses
Wide vision and low volume
4 way buckle design for superior comfort and storage if needed