The Butler Creek Flip-Open EYE is a hinged protective cover designed for the eyepiece of an optical scope, helping to keep the lens clean during transport, storage, and use in outdoor conditions.
The Butler Creek Flip-Open EYE is a hinged protective cover designed for the eyepiece of an optical scope, helping to keep the lens clean during transport, storage, and use in outdoor conditions. The spring-loaded cap opens quickly with a thumb press, and you can choose from 19 different sizes to fit the specific outer diameter of your optic. Suitable for use For protecting the eyepiece lens of an optical scope For hunting and target shooting During transport and storage of optics In dusty, rainy, or snowy environments When moving through forests and brush To prevent scratches that can occur in a gun case For optics with a round eyepiece housing For optics with an oval eyepiece housing, if the appropriate size is selected For users who want a quickly opening optic cover Why choose Butler Creek Flip-Open EYE? Specifically designed cover for the eyepiece of an optical scope Spring-loaded Flip-Open opening mechanism Can be opened with one hand and a thumb press Helps protect the lens from dust, moisture, and scratches Mounts directly onto the eyepiece housing of the optic Usually does not require separate tools 17 round and two oval sizes Size range approximately 31.1–45.1 mm Durable synthetic material construction Low profile and remains beside the optic when open Allows the lens to remain protected until immediate use Technical specifications Manufacturer: Butler Creek Product series: Flip-Open Product type: optic eyepiece cover Designation: EYE Mounting location: eyepiece of optical scope Opening: spring-loaded hinged cap Mounting method: pressed onto the eyepiece housing of the appropriate diameter Material: synthetic material Color: black Number of available sizes: 19 Round sizes: 17 Oval sizes: 2 Smallest nominal size: 31.1 mm Largest nominal size: 45.1 mm Compatibility: determined by the outer diameter of the optic's eyepiece housing Sales unit: one eyepiece cover in the chosen size All Butler Creek EYE sizes The size shown below indicates the recommended outer diameter of the optic's eyepiece housing at the installation point. The size number does not always indicate increasing order. 34.1 mm or 1.341" 31.1 mm or 1.225" 33.0 mm or 1.300" 35.3 mm or 1.388" 36.4 mm or 1.432" 37.0 mm or 1.457" 37.3 mm or 1.468" 37.7 mm or 1.485" 38.5 mm or 1.516" 39.4 mm or 1.550" 39.9 mm or 1.570" 40.8 mm or 1.605" oval, 42.2 × 36.8 mm or 1.66 × 1.45" 42.2 mm or 1.660" 42.5 mm or 1.675" 43.2 mm or 1.700" 43.9 mm or 1.730" 45.1 mm or 1.775" oval, 43.2 × 36.1 mm or 1.70 × 1.42" Sizes are nominal values. The construction of the optic, coating, and measurement location may affect the actual fit, so be sure to measure the eyepiece housing precisely before ordering. Included in the set One Butler Creek Flip-Open EYE eyepiece cover in the chosen size The optic's objective lens cover is not included and must be selected separately from the Butler Creek OBJ sizes if needed. Frequently Asked Questions How do I choose the correct size for the Butler Creek EYE optic cover? Measure the outer diameter of the eyepiece housing precisely with a caliper at the exact spot where the cover will be installed. Compare the result with the list of sizes and do not choose a cover based on the optic tube or objective lens nominal size. What should I do if the measured diameter falls between two sizes? The Butler Creek sizing guide recommends trying the smaller size if your measurement falls between two sizes, as the cover must fit tightly on the eyepiece. However, the cover should not be forced on or excessively stretched. Can the EYE cover be used on the optic's objective lens? Generally, no. Models marked EYE are designed for the eyepiece lens. For the front, or objective lens of the optic, a separate OBJ cover in the appropriate size must be selected. Are both optic covers included in the set? No. The product includes one EYE eyepiece cover in the chosen size. To have a complete set, the objective lens cover must be selected separately. Does the cover make the optical scope waterproof? No. The cover helps protect the lens from raindrops, dust, and dirt, but it does not make the optic waterproof or replace the manufacturer's recommended optic maintenance. Is Butler Creek EYE suitable for an oval eyepiece? Yes, there are two oval options available: EYE 15 with a size of 42.2 × 36.8 mm and EYE 21 with a size of 43.2 × 36.1 mm. Measure the width and height of the oval housing separately. When is Butler Creek Flip-Open EYE the right choice? Butler Creek EYE is suitable for users who want a permanently installed, quickly opening protection for the eyepiece lens of their optical scope. It is practical for hunting, where the lens needs protection from rain, snow, branches, and dirt, but the scope must be ready for use at any moment. If you want to cover both the eyepiece and objective lens at once with a single removable cover, a universal optic cover with a connecting strap may be more suitable. For very unusually shaped eyepieces or housings outside the listed sizes, a flexible universal cover should be chosen. We recommend Before ordering, measure the optic's eyepiece housing with a caliper, not a ruler. The measurement should be taken at the actual installation point, as the diameters of the diopter adjustment, magnification ring, and eyepiece housing may differ. For round housings, check the size in at least two directions. If the results differ significantly, it may be an oval eyepiece. Install the cover on a clean and dry surface and make sure that its opening direction does not interfere with the rifle's bolt handle, magnification ring, or the shooter's field of view. The cover must fit securely, but installation should not require excessive force. A cover that is too large may shift during use, while one that is too small may be damaged or interfere with optic adjustment. For optimal protection, add a Butler Creek OBJ cover of the appropriate size to the front lens of the optic. After using in rain or snow, open both covers, dry the optic, and clean the lenses with the appropriate products. Quick-opening protection for your optic eyepiece The Butler Creek Flip-Open EYE helps keep your optical scope's eyepiece lens clean and ready for use whether you're hunting, at the shooting range, or transporting your gear. Choose the appropriate variant from 19 available sizes for your eyepiece housing, and supplement your optic's protection with a suitable OBJ objective lens cover if needed.
The Butler Creek Flip-Open EYE is a hinged protective cover designed for the eyepiece of an optical scope, helping to keep the lens clean during transport, storage, and use in outdoor conditions. The spring-loaded cap opens quickly with a thumb press, and you can choose from 19 different sizes to fit the specific outer diameter of your optic. Suitable for use For protecting the eyepiece lens of an optical scope For hunting and target shooting During transport and storage of optics In dusty, rainy, or snowy environments When moving through forests and brush To prevent scratches that can occur in a gun case For optics with a round eyepiece housing For optics with an oval eyepiece housing, if the appropriate size is selected For users who want a quickly opening optic cover Why choose Butler Creek Flip-Open EYE? Specifically designed cover for the eyepiece of an optical scope Spring-loaded Flip-Open opening mechanism Can be opened with one hand and a thumb press Helps protect the lens from dust, moisture, and scratches Mounts directly onto the eyepiece housing of the optic Usually does not require separate tools 17 round and two oval sizes Size range approximately 31.1–45.1 mm Durable synthetic material construction Low profile and remains beside the optic when open Allows the lens to remain protected until immediate use Technical specifications Manufacturer: Butler Creek Product series: Flip-Open Product type: optic eyepiece cover Designation: EYE Mounting location: eyepiece of optical scope Opening: spring-loaded hinged cap Mounting method: pressed onto the eyepiece housing of the appropriate diameter Material: synthetic material Color: black Number of available sizes: 19 Round sizes: 17 Oval sizes: 2 Smallest nominal size: 31.1 mm Largest nominal size: 45.1 mm Compatibility: determined by the outer diameter of the optic's eyepiece housing Sales unit: one eyepiece cover in the chosen size All Butler Creek EYE sizes The size shown below indicates the recommended outer diameter of the optic's eyepiece housing at the installation point. The size number does not always indicate increasing order. 34.1 mm or 1.341" 31.1 mm or 1.225" 33.0 mm or 1.300" 35.3 mm or 1.388" 36.4 mm or 1.432" 37.0 mm or 1.457" 37.3 mm or 1.468" 37.7 mm or 1.485" 38.5 mm or 1.516" 39.4 mm or 1.550" 39.9 mm or 1.570" 40.8 mm or 1.605" oval, 42.2 × 36.8 mm or 1.66 × 1.45" 42.2 mm or 1.660" 42.5 mm or 1.675" 43.2 mm or 1.700" 43.9 mm or 1.730" 45.1 mm or 1.775" oval, 43.2 × 36.1 mm or 1.70 × 1.42" Sizes are nominal values. The construction of the optic, coating, and measurement location may affect the actual fit, so be sure to measure the eyepiece housing precisely before ordering. Included in the set One Butler Creek Flip-Open EYE eyepiece cover in the chosen size The optic's objective lens cover is not included and must be selected separately from the Butler Creek OBJ sizes if needed. Frequently Asked Questions How do I choose the correct size for the Butler Creek EYE optic cover? Measure the outer diameter of the eyepiece housing precisely with a caliper at the exact spot where the cover will be installed. Compare the result with the list of sizes and do not choose a cover based on the optic tube or objective lens nominal size. What should I do if the measured diameter falls between two sizes? The Butler Creek sizing guide recommends trying the smaller size if your measurement falls between two sizes, as the cover must fit tightly on the eyepiece. However, the cover should not be forced on or excessively stretched. Can the EYE cover be used on the optic's objective lens? Generally, no. Models marked EYE are designed for the eyepiece lens. For the front, or objective lens of the optic, a separate OBJ cover in the appropriate size must be selected. Are both optic covers included in the set? No. The product includes one EYE eyepiece cover in the chosen size. To have a complete set, the objective lens cover must be selected separately. Does the cover make the optical scope waterproof? No. The cover helps protect the lens from raindrops, dust, and dirt, but it does not make the optic waterproof or replace the manufacturer's recommended optic maintenance. Is Butler Creek EYE suitable for an oval eyepiece? Yes, there are two oval options available: EYE 15 with a size of 42.2 × 36.8 mm and EYE 21 with a size of 43.2 × 36.1 mm. Measure the width and height of the oval housing separately. When is Butler Creek Flip-Open EYE the right choice? Butler Creek EYE is suitable for users who want a permanently installed, quickly opening protection for the eyepiece lens of their optical scope. It is practical for hunting, where the lens needs protection from rain, snow, branches, and dirt, but the scope must be ready for use at any moment. If you want to cover both the eyepiece and objective lens at once with a single removable cover, a universal optic cover with a connecting strap may be more suitable. For very unusually shaped eyepieces or housings outside the listed sizes, a flexible universal cover should be chosen. We recommend Before ordering, measure the optic's eyepiece housing with a caliper, not a ruler. The measurement should be taken at the actual installation point, as the diameters of the diopter adjustment, magnification ring, and eyepiece housing may differ. For round housings, check the size in at least two directions. If the results differ significantly, it may be an oval eyepiece. Install the cover on a clean and dry surface and make sure that its opening direction does not interfere with the rifle's bolt handle, magnification ring, or the shooter's field of view. The cover must fit securely, but installation should not require excessive force. A cover that is too large may shift during use, while one that is too small may be damaged or interfere with optic adjustment. For optimal protection, add a Butler Creek OBJ cover of the appropriate size to the front lens of the optic. After using in rain or snow, open both covers, dry the optic, and clean the lenses with the appropriate products. Quick-opening protection for your optic eyepiece The Butler Creek Flip-Open EYE helps keep your optical scope's eyepiece lens clean and ready for use whether you're hunting, at the shooting range, or transporting your gear. Choose the appropriate variant from 19 available sizes for your eyepiece housing, and supplement your optic's protection with a suitable OBJ objective lens cover if needed.
