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Post by duckbill on Oct 14, 2006 21:40:58 GMT -8
Right in the center, there is an area called the fovia. It is the area of the eye that has the greatest density of light-sensing cells (cones and rods). Here is a reference to the anatomy of the eye: en.wikipedia.org/wiki/Retina#Physical_structure_of_human_retinaThe fovia is where we get our clearest vision, which is important in dim light and poor visibility when diving. It is also right at the center of the eye, as is seen in this diagram: John Actually, it would depend on just how dim the light is. The fovea is almost devoid of rods, which are the sensors used in low light. Once the light is dim enough for the rods to have the advantage over the cones, then off-center vision is the key. That is what we were taught in the Marines. I think your references also confirm this. I have to confess that my modern, low-volume masks have a wider field of view than my oval mask, BUT the up-down field of view in my oval mask wins hands down! Then again, my oval mask does NOT have finger pockets. The nose pocket or finger pockets, purge valves, center posts, etc. of 'modern' masks ruin the view with obstructions. That is why I have to say that, yes, the modern mask can boast a wider field of vision, but my oval has a much, much less restricted view (except for my Schnauze!). I haven't used a tri-view mask, but I know for myself that my eyes can only turn so far. It always seemed to me that the side panels were too far off to the side to really do much good. Then there must be the weight factor. I get tired of hearing about "low volume" when it comes to SCUBA masks. Who cares?! Even with my largest volume mask, a small snort is all it takes to equalize the pressure, and I don't forsee having to clear the mask without the SCUBA air supply any time soon. I mean, if my SCUBA was down AND my mask were off, I think I'd be searching for surface air anyway (if solo).
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Post by SeaRat on Oct 14, 2006 22:40:49 GMT -8
Duckbill,
You are right about the rods being absent in the fovia; thanks for the correction. It is interesting how much we can learn from a simple discussion on the oval mask.
John
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Post by SeaRat on Oct 15, 2006 8:23:46 GMT -8
Let's talk about the oval masks themselves. There are a lot of them. Here's the Sea Hunt version: This is a Voit mask, with strap attachments on the skirt. I did not like this one, as it hurt my head. Any other observations? John
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Post by Deleted on Oct 15, 2006 11:11:38 GMT -8
Searat says: "Let's talk about the oval masks themselves. There are a lot of them."
My first mask, an oval, I bought as a kid in 1964 at Lenoards Department store in Fort Worth, was a Colombo made by Nemrod. Had the screw on the top of the frame.
I still have it. Rubber is soft and squishes up to my face now, but does not show deteriation like others I have. Has a 5.25" face plate. No pad or nose pockets. This mask has low volume for a oval.....lens rubs my short nose just like the masks did to old J.C.'s shnozz....and his was a honker.........
Anyway, vision is limited to the sides, but upper and lower is pretty good........
Mossback
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Post by nemrod on Oct 15, 2006 15:00:47 GMT -8
One of my favorite already pictured, the Healthways Compensator Masque, number 1223, this one in a deep blue. Sure would love to find their Panoramique, number 1222. Anyways, note the screw and band, classic low volume oval style and the beautiful box correctly displaying the mask on the forehead where it belongs despite what the US Navy might mistakenly think--lol. The mask and box were made in France. The box is unusual in the colors and displays as well a fellow clad in brief with knife tucked at waist. The double J snorkel is quaint and of course note the spear through the fish which he is holding, not so clear is the arrablette which has been dropped with line trailing away as our underwater hunter wrestles his monster catch. Nemrod
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Post by nemrod on Oct 15, 2006 15:08:42 GMT -8
SeaRat, you mentioned the strap on the skirt, I am not sure that I have ever seen an oval which did not have this design. Have you seen ovals with the strap from the lens frame as most modern masks are designed. Curiously, the Mares X series masks use a skirt attached strap unlike almost all modern masques.
Nemrod
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Post by SeaRat on Oct 15, 2006 17:38:28 GMT -8
Nemrod, No, this was a mask that AMF Voit producted in the 1950s then discontinued. But it was worn by Lloyd Bridges (aka Mike Nelson) for the earlier parts of the series. Here's the mask: I got it from this website: www.seahuntadventures.com/Mike_Nelson/mike_nelson.html If you look closely, the mask strap attaches to the edge of the skirt, not up close to the lens. That is why I did not like it--that part pushed against my temple and hurt. John
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Post by tomcatpc on Apr 7, 2015 17:04:21 GMT -8
I know this topic is pushing a decade old, but what ever. I just ordered a new production Oval Mask from Vintage Double Hose. Got the small size as I have a smaller face. I do think I have a Shotgun snorkel lurking about as well. It is an older 16 gauge with Damascus twist barrel, so have to have it checked out first to see if it is safe to use. Mark
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Post by nikeajax on Apr 7, 2015 18:06:15 GMT -8
Gee Mark, you can play Clutch Cargo now! Check it out yo, he's using a DW like yours: "16 gauge with Damascus..."Wait, are you talking about one of these shotguns... Jaybird
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Post by tomcatpc on Apr 7, 2015 18:24:33 GMT -8
LOL!!!! I've seen Clutch before, LOL!!! Yes, I was making a joke about the 16 ga shotgun. But, I do have a Shotgun snorkel. Mark
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Post by SeaRat on Apr 8, 2015 21:44:16 GMT -8
Gee Mark, you can play Clutch Cargo now! Check it out yo, he's using a DW like yours: "16 gauge with Damascus..."Wait, are you talking about one of these shotguns... Jaybird Did anyone notice how well and detailed the drawings of Clutch Cargo's dive gear is? Note the correct use of the double D-ring safety lacing, and that the mask is correct for the original oval mask. Very well done. John
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Post by tomcatpc on Apr 9, 2015 10:54:52 GMT -8
Just got the Clutch Cargo mask in the mail today. What can I use to remove the protective coating that comes on a new mask?, short of having "the special ointment" that is used specifcally for this purpose? I had heard toothpaste works? I've used toothpaste for anti-fog before, but does it work to remove the coating? Mark
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Post by duckbill on Apr 12, 2015 20:26:02 GMT -8
I had heard toothpaste works? I've used toothpaste for anti-fog before, but does it work to remove the coating? Mark Toothpaste IS for initially removing the film. The mask will fog with the film on the plate. Just be sure to use basic, white toothpaste, and rinse well. I would never use toothpaste as a general anti-fog. To do so would require leaving a toothpaste film on your plate. Have you ever gotten toothpaste in your eyes? If you don't want to use the commercial anti-fog (a 2 oz. bottle of "500 PSI" is about a lifetime supply and works great), lightly rinsed spit will work O.K.
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Post by nikeajax on Apr 14, 2015 10:01:20 GMT -8
I haven't used a tri-view mask, but I know for myself that my eyes can only turn so far. It always seemed to me that the side panels were too far off to the side to really do much good. Then there must be the weight factor. DB, actually, I have found that the side windows work exceptionally well on the tri-views! There's an old star gazers trick, which comes into play with the tri-views: don't look directly at something, but see it out of your peripheral vision. I was told that you have more light gathering ability in your peripheral than you do in your forward vision, which is why when you try to find something like the Andromeda Galaxy with a light polluted sky you cant find it, but, if you open our field of vision, you'll be able to locate it quite easily in the corner of your eyes. I also like that they have a purge valve: I have yet to see a low volume mask with one: I'm not saying that all of them do not have them, just ain't never saw one 's'all... Jaybird
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Post by nikeajax on Apr 14, 2015 10:09:51 GMT -8
Gee Mark, you can play Clutch Cargo now! Check it out yo, he's using a DW like yours: Jaybird Did anyone notice how well and detailed the drawings of Clutch Cargo's dive gear is? Note the correct use of the double D-ring safety lacing, and that the mask is correct for the original oval mask. Very well done. John John, yeah, isn't that totally boss! When I first noticed it I looked at the USD catalog and found that he was using ALL USD gear too: if I remember correctly his mask and fins were "Squales": Jaybird
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