Derek_S;264997 wrote: That sounds like great advice. I have never went through all that for a mask. Very cool.
Sorry to hear that Derek. This is a very common process for a quality dive shop. A quick search online will give you a guide to the process and show you I am not crazy.
I forgot to mention to bring a mouthpiece with you for the fit. The mouthpiece should be in when you fit your mask. If you do not own a mouthpiece, get a replacement one just for the fitting, or stick a snorkel mouthpiece in your mouth.
To explain more about the blowing out part. Once you have about 4 or 5 masks that you think fit, more likely 2, you put them on your face with the strap and blow out. Where the air leaves is the weakest part of the seal between the mask and your face. The harder you have to blow for air to escape the better the seal. Ideally the air should escape from your forehead, where the mask will have a single fold to seal. (look at a mask to see what I am talking about, the bottom 3/4 of the mask have a double seal) If the air escapes around your nose or smile lines it is not a good fit. This is a really tricky part and remember to keep all of your hair out of the way, it will prevent a good seal and may make you think that you have a good mask from air leaking out at the top first.
When you are diving you will be blowing air out of your nose to keep the air pocket on your face at a gentle pressure. If the mask is not fitted to your face you will need to keep more pressure in this pocket to keep water out. At depth this is quite unpleasant, and you will blow in and out and worry with it. Now your mask is full of fog, your face hurts, and when you get to the surface after 30 minutes you look like a giant raccoon. (remember everyone has cameras on a dive boat)
Opinions:
Having a well fitted mask is the best possible investment in dive equipment. You do not even notice your mask, you play with it less so it is free of fog, and you enjoy the dive.
Black silicon is a plus if the mask fits. Personally I avoid purge valves when possible.
-Charles