Uh, excuse me, you mean like the one on my forehead? First of all a good oval mask does not have tunnel vision. They are also very functional, low volume, easily cleared and not prone to capturing puddles of water. I have been diving the six inch ovals for decades, I ought to know. Voit, Dacor are good brands and often show up on ebay but shop for one in good condition. Vintagescubasupply.com has some imported six inch oval masks.
I also have a variety of masks form the ScubaPro Fino to the most recent Mares X vision, a good quality oval holds it's own. They have gone out of style only because split glass bug eye types are the fad now. In the past there were ovals that had extremely low volume and excellent vision. The Voit and Dacor are the ones I mostly use, on my forehead is a Dacor, my favorite is a 1958 oval imported from France, the navy blue rubber is soft and supple and the mask hugs my face as if it grew there. If your a Jet fin guy being as they have been around since the 60s maybe you need the mask that matches them. N
