OK, I am not that far gone -- yet. I like the tube that they sell but I don't think I can get it before Friday!
Maybe you can find something like this?
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OK, I am not that far gone -- yet. I like the tube that they sell but I don't think I can get it before Friday!
I am thinking that unless I get something with the air gap between two lenses it's not going to be worth much.Maybe you can find something like this?
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You are exactly right. The way the magnifying lens works depends on the ratio of the refractive index of the lens material (plastic or glass) to the refrative index of the surrounding medium (air or water). glass-to-air is excellent; plastic-to-water is horrible. Glass to water is OK, but much better is the compound magnifier (two lenses with an air gap in-between) so you get glass-to-air magnification, doubled, plus glass-to-water, doubled.I am thinking that unless I get something with the air gap between two lenses it's not going to be worth much.
You are exactly right. The way the magnifying lens works depends on the ratio of the refractive index of the lens material (plastic or glass) to the refrative index of the surrounding medium (air or water). glass-to-air is excellent; plastic-to-water is horrible. Glass to water is OK, but much better is the compound magnifier (two lenses with an air gap in-between) so you get glass-to-air magnification, doubled, plus glass-to-water, doubled.
Reefnet makes a smaller uw magnifier, the SubSee, in two different powers, and you can get a handle with it. It is also excellent, but has a smaller viewing window than the big Dutch one. It also costs more.
ReefNet Inc. | SubSee Magnifier and Adapter
Amazon came through again & again. It looks great on dry land, but as Luko says, it might not be magnifying by much underwater, but it’s better than nothing. So, we’ll see in 2 weeks, Bill.
BTW, it ain’t plastic! It’s GLASS!
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Fill your sink and try it. That would be a underwater test.
Amazon came through again & again. It looks great on dry land, but as Luko says, it might not be magnifying by much underwater, but it’s better than nothing. So, we’ll see in 2 weeks, Bill.
BTW, it ain’t plastic! It’s GLASS!
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