{"id":5662562,"date":"2020-10-19T20:31:05","date_gmt":"2020-10-19T18:31:05","guid":{"rendered":"https:\/\/www.optics-trade.eu\/blog\/?p=5662562"},"modified":"2020-10-19T21:38:51","modified_gmt":"2020-10-19T19:38:51","slug":"why-binoculars-are-waterproof","status":"publish","type":"post","link":"https:\/\/www.optics-trade.eu\/blog\/why-binoculars-are-waterproof\/","title":{"rendered":"Why are binoculars waterproof?"},"content":{"rendered":"

Introduction\u00a0<\/span><\/h1>\n

Since their inception, binoculars<\/strong><\/a> have been the greatest\u00a0<\/span>optical aids<\/span>\u00a0to\u00a0<\/span>wildlife photographers<\/span>, marine crews,<\/span>\u00a0snipers,<\/span>\u00a0birdwatchers<\/a><\/span>,<\/span>\u00a0and campers alike.\u00a0<\/span>Their ability to bring objects up close to the eye without using sophisticated technology has been one of the reasons\u00a0<\/span>for<\/span>\u00a0their popularity among<\/span>\u00a0professionals and<\/span>\u00a0enthusiasts. The relief that everyone without prior knowledge can operate\u00a0<\/span>one<\/span>\u00a0is quite satisfying in itself<\/span>\u00a0but still, binoculars are delicate devices that need to be handled with care<\/strong> and l<\/span>ike\u00a0<\/span>most<\/span>\u00a0optical devices,\u00a0<\/span>such as camera lenses, their pe<\/span>rformance<\/span>\u00a0<\/span>can take it a hit if\u00a0<\/span>certain precautionary measures are not considered during their use.<\/span>\u00a0<\/span><\/p>\n

\"Binoculars<\/p>\n

E<\/span>quipment like\u00a0<\/span>binoculars and telescopes are susceptible to potential moisture damage<\/strong> because of their frequent use in humid places, such as sailing<\/span> and in rainforests. <\/span>Since<\/span>\u00a0air is an ultimate carrier of water vapour, a significant amount of moisture would get stuck inside the optical housing. This trapped moisture start<\/span>s<\/span>\u00a0to deposit on the internal surfaces of the eyepieces<\/a><\/strong> and objective lenses<\/strong> and the walls of<\/span>\u00a0the\u00a0<\/span>chassis<\/span>\u00a0if they are exposed to sudden low-temperatures.\u00a0<\/span>\u00a0<\/span><\/p>\n

While it is not difficult to clean a little water on your eyeglasses, but reaching inside the binoculars for wiping off excessive moisture is not something that everyone is qualified to do on their own. Little by little, the moisture becomes a fog<\/span>–<\/span>like appearance on the lenses and effectively obstructs the light passing through them. View through such a binocular is blurry and has\u00a0<\/span>the<\/span>\u00a0potential of damaging\u00a0<\/span>your eyesight if its use is continued.<\/span>\u00a0<\/span>\u00a0<\/span><\/p>\n

To counter this issue, a German optics manufacturer Steiner<\/strong> came up with the idea of \u201cfog-proof\u201d<\/a><\/strong> binoculars. Their design used pressurized Nitrogen to purge the air<\/a> inside the barrels and used rubber\u00a0<\/span>O-rings<\/strong>\u00a0to prevent the gas from leaking. Their method was not only effective<\/span>\u00a0but was also cost-<\/span>effective due to the abundance of Nitrogen<\/strong> in the atmosphere.\u00a0<\/span>Initially marketed towards armed personnel, this became an instant hit among the masses.<\/span>\u00a0<\/span><\/p>\n

Due to a pressurized housing and rubber seals, these fog-proof binoculars<\/strong> also offered some form of waterproofness<\/a><\/strong><\/span>. Since the gas is under considerable pressure compared to the standard atmosphere, <\/span>in theory,\u00a0<\/span>the positive pressure difference\u00a0<\/span>would help<\/span>\u00a0keep unwanted air, dust<\/span>,<\/span>\u00a0and water from contaminating the\u00a0<\/span>internal compo<\/span>nents of binoculars, but in practice<\/span>,<\/span>\u00a0this was not always the case. In fact<\/span>,<\/span>\u00a0<\/span>at<\/span>\u00a0the start,\u00a0<\/span>most people mistook their devices to be waterproof and ended up with water damage when they were not careful in using their binoculars around water.<\/span><\/p>\n

\"water_binoculars\"
Source: wiseGEEK<\/figcaption><\/figure>\n

Nowadays, all modern binoculars are<\/span>\u00a0not just fog-proof<\/strong> or weather<\/strong><\/span>proof<\/strong> as<\/span>\u00a0some people like to call them, but a majority of them are<\/span>\u00a0also<\/span>\u00a0waterproof<\/strong> rated. The initial fog-proof design of binoculars has been improved over the years to cater\u00a0<\/span>to\u00a0<\/span>the waterproofing ability as well. This is especially important\u00a0<\/span>because<\/span>\u00a0the idea behind fog-proofing is to eliminate wat<\/span>er presence one way or another, so waterproofing is a no-brainer.<\/span>\u00a0<\/span><\/p>\n

The waterproofness is a must<\/span>–<\/span>have feature for marine binoculars<\/strong> since\u00a0<\/span>marine environments have an entirely different effect on optics. Mariners<\/span>\u00a0<\/span><\/a>frequently use binoculars\u00a0<\/span>around\u00a0<\/span>salt<\/span>water which can permanently\u00a0<\/span>harm<\/span>\u00a0just about everything.\u00a0<\/span>The salts present in ocean water can\u00a0<\/span>react with<\/span>\u00a0<\/span>premium<\/span>\u00a0layers\u00a0<\/span>of<\/span>\u00a0lenses\u00a0<\/span>in a way that they become unusable.\u00a0<\/span>Nevertheless, it is better to have waterproof binoculars and not need the feature, than running into a situation where it is needed and not have it, like unexpected rain or an unwanted splash of water on a bare binocular.<\/span><\/p>\n

 <\/p>\n

Advantages of Waterproofness\u00a0<\/span><\/h1>\n

Gases under pressure have a tendency to slowly leak over time. This phenomenon can be detected using a simple helium balloon. After some time,\u00a0<\/span>the pressurized helium atoms manage to alter the elastic properties of the balloon material and gradually make their way out of the balloon through the knot. Similar is the case with a pair of binoculars. Nitrogen<\/strong> and Argon<\/strong> molecules will slowly leak through the joints in the binocular\u00a0<\/span>chassis<\/span> which are sealed by rubber gaskets.<\/span><\/p>\n

\"Steiner<\/p>\n

Waterproofing<\/strong> is achieved by\u00a0<\/span>using<\/span>\u00a0high-quality rubber O-rings<\/strong> around all joints in the optical housing and\u00a0<\/span>housing-lens interfaces. The\u00a0<\/span>filler\u00a0<\/span>gas<\/span>es<\/span>\u00a0Nitrogen or Argon are not the only things that are under pressure but the O-ring seals are also fitted under a compressive load. Due to their elastic spring-like nature, they retain this energy<\/span>\u00a0and ensure<\/span>\u00a0that there is an air and water<\/span>–<\/span>tight barrier between the\u00a0<\/span>eyepiece and objective\u00a0<\/span>lenses, focusing mechanism and the\u00a0<\/span>housing components<\/span>\u00a0of the binocular<\/span>.\u00a0<\/span>If\u00a0<\/span>all<\/span>\u00a0binoculars are inhe<\/span>rently made to be waterproof, not only will water not enter inside the housing but either gas will have to put substantial effort to bypass the\u00a0<\/span>water-tight O-rings<\/span>.<\/span>\u00a0<\/span><\/p>\n

Now, since it is impossible for water to enter the housin<\/span>g, the chances of internal rust\u00a0<\/span>are close to zero.<\/strong>\u00a0<\/span>Adventurers can freely use their beloved companions without a fear of\u00a0<\/span>unexpected rain ruining their day. The same remains true for mariners since large ocean waves are<\/span>\u00a0inevitable during deep-<\/span>sea exploration and reconnaissance missions, and ships are often vandalized by them.<\/span>\u00a0<\/span><\/p>\n

In addition to lens fogging,<\/strong> water is responsible for an even severe problem if it makes way inside the binocular housing<\/span>\u00a0and around lenses<\/span>, that is, fungus<\/strong> and mould<\/strong> development.<\/span>\u00a0Just like humans need\u00a0<\/span>o<\/span>xygen, water<\/span>,<\/span> and food to survive, Fungus typically requires a congested lowlight space with traces of air and water. This makes the barrels of the binoculars a perfect spot for fungal growth, which can take place in a few hours of exposure.<\/span><\/p>\n

\"binoculars_fungus\"
Source: Best of Binoculars<\/figcaption><\/figure>\n

Once<\/span>\u00a0the<\/span>\u00a0fungus is formed, there is no stopping to it. It will slowly grow to encompass the entire housing,\u00a0<\/span>e<\/span>specially the surface of lenses.\u00a0<\/span>While the use of various deterging agents is possible to remove fungus, they are<\/span>\u00a0known to secret enzymes that help with breaking down the objects around them for consumption. These enzymes have chemical properties\u00a0<\/span>that<\/span>\u00a0are strong enough<\/span>\u00a0<\/span>to<\/span>\u00a0etch the surface of le<\/span>nses to the point of no return. A waterproof design will\u00a0<\/span>inhibit fungus growth<\/span>, thanks to the absence of water.\u00a0<\/span>\u00a0<\/span><\/p>\n

The waterproof<\/a><\/span> feature does not only stop water from entering the housing, but it will also act as a barricade<\/strong> against dirt and other impu<\/span>rities that can ruin your view through the binocular. This is especially common\u00a0<\/span>when using your binocular in windy and dusty environments<\/span>, such as the countryside.<\/span><\/p>\n

 <\/p>\n

Are there still some binoculars not waterproof today?<\/h1>\n

These days, even<\/span>\u00a0fairly inexpensive binoculars and scopes\u00a0<\/span>offer\u00a0<\/span>waterproofness and fog-proofing, but there are still some binoculars\u00a0<\/span>that<\/span>\u00a0do not perform as they are advertised.<\/span>\u00a0Many knock-offs<\/strong> circling the marketplace attract the eyes of potential customers with their\u00a0<\/span>low<\/span>\u00a0price tags and\u00a0<\/span>customers do not realize they are in for a treat.<\/span>\u00a0Dirt cheap binoculars even lose their \u201cfog-proofing\u201d rather quickly after limited use, let alone waterproofing.\u00a0<\/span>\u00a0<\/span><\/p>\n

Some enthusiasts opt for antique <\/span>Porro prism<\/strong><\/span><\/a>\u00a0<\/strong>binoculars over contemporary roof prism<\/strong> binoculars because of their vintage appearance<\/strong> and sturdy\u00a0<\/span>built quality<\/span>. These old-fashioned binoculars<\/span>, that<\/span>\u00a0are easily available with collectors<\/span>\u00a0and large stores,<\/span>\u00a0often produce images with good contrast level compared\u00a0<\/span>t<\/span>o\u00a0<\/span>mid-level binoculars of today. There is, however, one problem with their design; since fog-proofing<\/strong> was not mainstream back in the day, such binocular<\/span>s will rarely be safe from fog, the question of their\u00a0<\/span>waterproofness is out of the window. If the use is strictly limited to plane spotting or stargazi<\/span>ng, you can still get away with\u00a0<\/span>vintage\u00a0<\/span>Porro prism<\/span>\u00a0binocular<\/span>s<\/span>.<\/span>\u00a0<\/span><\/p>\n

\"binoculars_4\"<\/p>\n

Conclusion\u00a0\u00a0<\/span><\/h1>\n

In the past, the use of binoculars\u00a0<\/span>was<\/span>\u00a0limited to wars, traveling,\u00a0<\/span>bird-<\/span>watching<\/span>,<\/span>\u00a0and stargazing but<\/span>\u00a0as they become cheaper<\/span>\u00a0due to technolog<\/span>ical advancement, people have found several other ways to utilize them. Binoculars are quite common among plane spotters, campers, hikers<\/span>,<\/span>\u00a0and even some photographers that use binocular as a telephoto lens aid for their smartphone cameras.\u00a0<\/span>\u00a0<\/span><\/p>\n

While as exciting as it all sounds, binocular users often find them<\/span>selves<\/span>\u00a0in the middle of lens fogging problems<\/span>,<\/span>\u00a0even though they\u00a0<\/span>did<\/span>\u00a0not use their device<\/span>s<\/span>\u00a0in the presence of water. The reason is the\u00a0<\/span>occurrence<\/span>\u00a0of water vapour in<\/span>\u00a0the<\/span>\u00a0<\/span>air<\/strong> which slowly accumulates inside the optical housing of binoculars and when they are exposed to a colder environment, this warm vapour instantly\u00a0<\/span>condenses<\/span>\u00a0into fog and deposits on the surfaces of objective and eyepiece lenses<\/span>, obstructing the light rays passing through both lenses.<\/span>\u00a0Apart from fog, moisture also promotes fungal growth<\/strong> inside the housing which causes irreversible damage to the lenses and housing internals.\u00a0<\/span>\u00a0<\/span><\/p>\n

Since reaching inside the binocular chassis for cleaning is not possible for every user, scientists came up with the idea of getting rid of the air inside the optical housing with the help of Nitrogen gas purging and sealing the barrels and focus mechanism with the use of rubber seals. This provided the essential fog-proofing for<\/span>\u00a0everyday use<\/span>\u00a0but was not effective enough to keep water from entering the housing from outside. Numerous users reported fogging issues with their fog-proof binoculars after accidentally dropping them in water or using in rainy weather.\u00a0<\/span>\u00a0<\/span><\/p>\n

Modern binoculars use specially designed O-rings<\/strong> in place of conventional rubber seals to keep water from entering. Consequently, the waterproof binoculars are more effective in keeping the purging molecules from leaving the housing, promising a longer fog protection<\/strong> than commonly available non-waterproof binoculars.\u00a0<\/span>\u00a0<\/span><\/p>\n

The good news is almost all binoculars that are available today are fog-proof and waterproof as well as light on the pocket, so no one needs to remain behind when it comes to following your hobbies.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Introduction\u00a0 Since their inception, binoculars have been the greatest\u00a0optical aids\u00a0to\u00a0wildlife photographers, marine crews,\u00a0snipers,\u00a0birdwatchers,\u00a0and campers alike.\u00a0Their ability to bring objects up close to the eye without using sophisticated technology has been one of the reasons\u00a0for\u00a0their popularity among\u00a0professionals and\u00a0enthusiasts. The relief that everyone without prior knowledge can operate\u00a0one\u00a0is quite satisfying in itself\u00a0but still, binoculars are delicate devices… Read More »Why are binoculars waterproof?<\/span><\/a><\/p>\n","protected":false},"author":14,"featured_media":5662963,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","footnotes":""},"categories":[158],"tags":[],"class_list":["post-5662562","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-binoculars"],"yoast_head":"\nWhy are binoculars waterproof? - Optics Trade Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.optics-trade.eu\/blog\/why-binoculars-are-waterproof\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why are binoculars waterproof? - Optics Trade Blog\" \/>\n<meta property=\"og:description\" content=\"Introduction\u00a0 Since their inception, binoculars have been the greatest\u00a0optical aids\u00a0to\u00a0wildlife photographers, marine crews,\u00a0snipers,\u00a0birdwatchers,\u00a0and campers alike.\u00a0Their ability to bring objects up close to the eye without using sophisticated technology has been one of the reasons\u00a0for\u00a0their popularity among\u00a0professionals and\u00a0enthusiasts. 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