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What is the purpose of Binocular Eyecups and what do they mean to me?
There are only two reasons manufacturers provide Eyecups for binoculars. One is provide "shade/cover" between the focal lens of the binoculars eyepiece and the eye and two, to provide a "stand-off" from the eye to the focal lens or eyepiece of the binoculars.
o EYECUPS The eyecups of binoculars or the extension on top of the binocular focal eyepiece (the lens you look through) are normally made of rubber and are called "rubber eyecups". Some binocular manufacturers have switched to or installed 'metal' or 'plastic' eyecups on their binoculars as a selling point and say these will last longer rubber eyecups and are easier to operate. Binocular rubber eyecups are designed to be 'folded' or 'rolled' down while metal eyecups are designed to be 'twisted' up or 'pop' up. It makes no difference which kind of eyecups your binoculars have as far as the intended purpose of the binocular eyecups is concerned.
o SHADE/COVER The first purpose of the binoculars eyecups is to provide shade or cover from sunlight, either direct or indirect, between the eye and the binoculars eyepiece. Providing shade or cover between the eye and the binoculars eyepiece greatly enhances the clarity and sharpness of the object being viewed through the binoculars by reducing glare onto the focal lens of the binoculars and the eye. Binocular eyecups should always be in the 'up' or normal position when viewing through your binoculars if you are not wearing glasses. If you are wearing glasses for corrective vision or sunglasses and do not want to remove them before viewing through your binoculars, fold or twist the binoculars eyecups down before viewing. This will bring the binoculars closer to your eyes while providing the approximate eye to lens stand-off of the binoculars (discussed in the nest paragraph). When the binoculars eyecups are in the down position for glasses use, the binocular eyecups provide very little shade/cover from outside light sources.
o STAND-OFF Binocular stand-off is referred to by binocular manufacturers as "eye relief". This is the distance from the eye to the focal lens of the binoculars that offers the greatest ability of the binoculars 'full field of view" in millimeters when held that distance from the eye. Example, Eye relief = 15mm. Eye relief can range anywhere between 5mm to 20mm depending on lens diameters. Most binocular manufacturers design their eyecups, whether rubber, metal or plastic to a length that offers the approximate eye relief distance designated in their specifications. In other words, if the binoculars eye relief is 15mm, the binoculars eyecups are normally 15mm in length from the eyepiece lens to where the eyecups will touch your eyelids or brow, creating a 15mm stand-off for the optimum field of view of the binoculars.
o GLASSES WEARERS If you wear glasses it is recommended that you remove your glasses when viewing through your binoculars if your vision is such that you can focus clearly without them. For most people that wear glasses this is no problem but for some, especially those with astigmatisms, this is not always the best situation for clear, sharp binocular viewing. Viewing through your binoculars without your glasses when you can still focus clearly will offer you the best viewing through your binoculars as far as eye relief/stand-off and light glare are concerned.
In conclusion, now that you know the purpose of binocular eyecups we hope you will be able to view more clearly and glare free by using your binocular eyecups as they were designed and intended to be used.
ADDITIONAL EYECUPS NOTE: Store your binoculars in their case or wherever you store them with the eyecups in the "UP POSITION" especially if they are rubber. This keeps strain and stress away from the rubber where it folds over, which over long periods of time may cause stretching and or cracking of the rubber binocular eyecups. Also, in all cases, the binoculars protective lens covers are designed to fit over the binocular eyecups in the 'up' position. The binoculars lens covers will not fit in the down or folded position. Keep binocular lens covers on at all times when not viewing.
The author of this article, Donald Tuttle, is the owner of the website http://www.BinocularsWildlife.com and is an enthusiast and seller of binoculars, rangefinders and night vision optic equipment. Mr. Tuttle lives in Big Wonderful Wyoming where binoculars and rangefinders are a way of life for the avid hunter, sportsman and outdoor enthusiast. For other articles related to binoculars, rangefinders and night vision equipment, please go to http://www.binoculars.com
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Spy Optics - Lennox $59.99 Spy Optic Sunglasses style Lennox is a rectangular plastic frame. The Lennox features a saddle nose bridge for extreme comfort. The metal Spy Optic logo is inlaid in the temples. Spy Optic Sunglasses have lightweight shatter-impact-resistant lenses. |
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Spy Optics - Cloverdale $123.99 Spy Optics sunglasses style Cloverdale is a sleek, forged monel metal frame in a square aviator style. The Cloverdale is designed with adjustable nose pads and temple tips for perfect comfort. Featured on the temples is the signature Spy Optics logo. The |
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Spy Optics - Cloverdale $123.99 Spy Optics sunglasses style Cloverdale is a sleek, forged monel metal frame in a square aviator style. The Cloverdale is designed with adjustable nose pads and temple tips for perfect comfort. Featured on the temples is the signature Spy Optics logo. The |
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Spy Optics - Hielo $93.99 Spy Optics Sunglasses style Hielo is a sleek plastic frame, designed with sturdy 8mm hinges and a saddle nose bridge for extreme comfort and style. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 8-base curve lense |
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Spy Optics - Hielo $93.99 Spy Optics Sunglasses style Hielo is a sleek plastic frame, designed with sturdy 8mm hinges and a saddle nose bridge for extreme comfort and style. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 8-base curve lense |
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Spy Optics - Hielo $93.99 Spy Optics Sunglasses style Hielo is a sleek plastic frame, designed with sturdy 8mm hinges and a saddle nose bridge for extreme comfort and style. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 8-base curve lense |
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Spy Optics - Lacrosse $108.99 Spy Optics Sunglasses style Lacrosse is a sleek plastic frame, designed with sturdy 8mm hinges and a saddle nose bridge for superb comfort. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant Toric Arc lenses ensure 10 |
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Spy Optics - Lacrosse $108.99 Spy Optics Sunglasses style Lacrosse is a sleek plastic frame, designed with sturdy 8mm hinges and a saddle nose bridge for superb comfort. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant Toric Arc lenses ensure 10 |
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Spy Optics - Oasis $68.99 Spy Optics Sunglasses style Oasis is a cutting-edge and sleek plastic wrap frame. The Oasis is designed with an integrated hinge system and a saddle nose bridge for extreme comfort and style. Featured on the temples is the signature Spy Optics logo. The s |
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Spy Optics - Cooper $133.99 Spy Optics Sunglasses style Cooper is a sleek wrap frame. The Cooper is designed with durable metal hinges and a saddle nose bridge for extreme comfort. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 8-base Arc le |
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Spy Optics - Cooper $93.99 Spy Optics Sunglasses style Cooper is a sleek wrap frame. The Cooper is designed with durable metal hinges and a saddle nose bridge for extreme comfort. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 8-base Arc le |
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Spy Optics - Zoe $98.99 Spy Optics sunglasses style Zoe is a sleek frame designed with custom-built metal details and a saddle nose bridge for extreme comfort and style. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 8-base Arc lenses en |
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Spy Optics - Zoe $128.99 Spy Optics sunglasses style Zoe is a sleek frame designed with custom-built metal details and a saddle nose bridge for extreme comfort and style. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 8-base Arc lenses en |
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Spy Optics - Nolen $133.99 Spy Optics Sunglasses style Nolen is a cutting-edge and sleek wrap plastic frame. The Nolen is designed with sturdy metal 5 barrel stop hinges and a saddle nose bridge for extreme comfort and style. Featured on the temples are the signature Spy Optics log |
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Spy Optics - Hailwood $108.99 Spy Optics Sunglasses Hailwood is a custom built, high quality propionate wrap frame. Featured on the temples are cool custom metal details, as well as the signature Spy Optics logo. The scratch & impact-resistant 8-base Arc lenses ensure 100% UV protecti |
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Spy Optics - Hailwood $148.99 Spy Optics Sunglasses Hailwood is a custom built, high quality propionate wrap frame. Featured on the temples are cool custom metal details, as well as the signature Spy Optics logo. The scratch & impact-resistant 8-base Arc lenses ensure 100% UV protecti |
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Spy Optics - Yoko $148.99 Spy Optics sunglasses style Yoko is a sleek, forged monel metal alloy frame made with grilamid temples for unsurpassed durability. Featured on the temples is the signature Spy Optics logo. The scratch & impact-resistant 4-Base nylon shield lens ensures 10 |
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Spy Optics - Stratos II $59.99 Spy Optic Sunglasses style Stratos II is a plastic sport aviator with delicate metal studs on the temples and a cut-out on the nose bridge. The Stratos II features a saddle nose bridge for extreme comfort. The metal Spy Optic logo is inlaid in the templ |
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Spy Optics - Logan $73.99 Spy Optics Sunglasses style Logan is a sleek wrap frame. The Logan is designed with a built-in hinge system and a saddle nose bridge for extreme comfort, and made from bomb-proof grilamid for unprecedented durability. Featured on the temples is the signat |
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Spy Optics - Logan $73.99 Spy Optics Sunglasses style Logan is a sleek wrap frame. The Logan is designed with a built-in hinge system and a saddle nose bridge for extreme comfort, and made from bomb-proof grilamid for unprecedented durability. Featured on the temples is the signat |
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Spy Optics - Logan $118.99 Spy Optics Sunglasses style Logan is a sleek wrap frame. The Logan is designed with a built-in hinge system and a saddle nose bridge for extreme comfort, and made from bomb-proof grilamid for unprecedented durability. Featured on the temples is the signat |
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Spy Optics - Logan $73.99 Spy Optics Sunglasses style Logan is a sleek wrap frame. The Logan is designed with a built-in hinge system and a saddle nose bridge for extreme comfort, and made from bomb-proof grilamid for unprecedented durability. Featured on the temples is the signat |
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Spy Optics - Diablo $133.99 Spy Optics Sunglasses style Diablo is a cutting-edge and sleek plastic wrap frame. The Diablo is made from bomb-proof grilamid, and designed with slip-proof rubber temple tips and a saddle nose bridge for extreme comfort and style. The patented Scoop Vent |
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Mens Spy Optic Sunglasses Logan Sunglasses $119.95 Polarized Logan Sunglasses by Spy. |
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Spy Optic Sunglasses Logan Sunglasses $74.95 SPY Logan Sunglasses Fit like a glove and follows you into the mix. |
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Mens Spy Optic Sunglasses Logan Sunglasses $74.95 SPY Logan Sunglasses Fit like a glove. |
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Mens Spy Optic Sunglasses Hielo Sunglasses $94.95 Spy Optics Hielo Sunglasses in White Gloss/Grey |
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Mens Spy Sunglasses - Spy Blok Bronze Sunglasses $105 Make your presence known with the Blok Sunglasses by Spy. Contrast colored designs on temples. Neon pink Spy logo featured on temples. 6-Base lenses 100% UV protection. |
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