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About Kenko As one of the world's largest manufacturers of binoculars, Kenko has the experience and refined manufacturing techniques to produce high-quality, multi-coated phase coated glass optics that yield bright, sharp clear viewing under a wide variety of conditions. You may not know the name but the Kenko company is an original manufacturer with decades of experience in the production of outdoor optics. T H E P R O D U C T I O N P R O C E S S O F K E N K O B I N O C U L A R S 2
I N D E X World of Binoculars How Binoculars Works.....................................................4 Choose your world How to choose the right binoculars for the right activity......................10 Kenko Series Superior Roof Prism Binoculars..................................................12 Ultra View EX Series Advanced Roof Prism Binoculars..........................................14 Artos Series Classic Standard Porro Prism Binoculars...........................................16 Ultra View Series Multipurpose Porro Prism Binoculars..........................................18 Ultra View Zoom Series Standard Zoom Binoculars............................................20 New SG Series Compact Roof Prism Binoculars................................................22 Mirage Series Entry Level Porro Prism Binoculars...............................................24 Technical Data Table.......................................................................26 3
World of Binoculars How Binoculars Works 4
Magnification All binoculars are described by using a pair of numbers, such as 7 50 or 8 30. The first number, including the x, represents magnification or "power". This tells the degree to which the object observed is enlarged. For example, a 7x binocular makes an object appear seven times closer than when viewed by the naked eye. There are some models of binoculars that offer variable magnification, usually in the range of 5x to 8x.They are called zoom binoculars, and in most cases are not very suited for astronomical observations because of the inferior optical quality and are best suited for everyday and travel use. 8 X 42 Seen by naked eye 8x 12x 20x Objective Lens Diameter The second number in the two-number code is aperture (from the Latin aperire to open ), the most important specification of binoculars because it determines the light gathering ability of your binoculars. It represents the diameter of each of the objective lenses (the lenses furthest from your eye), given in millimeters. Field of View The field of view is the area of sky or land seen through your binoculars, determined by the design of the instrument s optics. It is expressed in two ways; as the width in feet at 1,000m, or in degrees. Apparent Field of View Apparent field of view is the angle of the magnified field when you look through binoculars. The larger the apparent field of view is, the wider the field of view you can see even at high magnifications. With the conventional method used previously, the apparent field of view was calculated by multiplying the real field of view by the binocular magnification. (With this formula, apparent field of view wider than 65 is called wide field of view.) at 1000m at 1,000 meters is the width of the visible area at a distance of 1,000 meters, which can be seen without moving the binoculars. Magnification is not that important, and in most cases comes within the range of 7x to 12x. If the magnification exceeds these figures, most likely you won t be able to hold the binoculars steady enough and the images will be blurry and in constant movement. This is especially frustrating when observing faint objects like galaxies and nebulae. A tripod mount or image-stabilized binoculars will get rid of this problem. 1,000m at 1,000 m 5
World of Binoculars How Binoculars Works 6
Exit pupil diameter If you divide the objective lens diameter by the magnification, you will get a number approximately between 4 and 8. This number is called the exit pupil, and represents the diameter of the beam of light that leaves the eyepiece when you hold a binocular with the objective pointed towards a light source. For example, a 7 50 binocular has an exit pupil of 50 divided by 7, just over 7 millimeters in diameter. Ideally, the exit pupil of your binocular should be equal or slightly smaller than the pupil of your dark-adapted eye. In this way the binocular delivers the maximum amount of light and produces the brightest possible images for its aperture. Average young adults under dark night conditions have pupils that are open to about 7 millimeters. This means that any instrument with an exit pupil larger than 7 millimeters will only waste light, as only the center of the light beam could enter the eyes. As we get older our eyes dilate less, so the exit pupil size we need decreases to around 5 millimeters. Brightness Relative brightness value is obtained by squaring the diameter of the exit pupil. The greater the relative brightness is, the brighter the image will be. With 8x42 binoculars, the brightness is (42 8)2= 28.1. This means that if the magnification is the same, the larger the effective diameter of the objective lens, the brighter the image will be. Eye relief Eye relief is the distance behind the eyepiece lenses at which the image is in focus, and indicates how far the binoculars can be held from your eyes and still allow you to see the entire apparent field of view. In general, the longer the focal length of an eyepiece, the greater is the eye relief. Standard binoculars have eye relief ranging from only a few millimeters to 25 millimeters or more. Long eye relief is especially necessary for eyeglass wearers, because glasses increase the distance between the lens and your eye. In case your eyeglasses correct only for near or farsightedness, you can simply take them off and refocus the binocular to compensate. Shortest focus distance This indicates the distance to the nearest point that can be focused. Generally, binoculars are used to make distant objects appear nearer. However, you can also enjoy magnified images from a close distance, such as when appreciating works of art or observing plants and insects. In this case, the shorter the focus distance of binoculars, the more details you can see. Minimum close focusing distance of binoculars is 1 to 2 meter. Prism Type Porro prism binoculars are named after Italian optician Ignazio Porro who patented this image erecting system in 1854. Binoculars of this type use a Porro prism in a double prism Z-shaped configuration to erect the image. This feature results in binoculars that are wide, with objective lenses that are well separated but offset from the eyepieces. Porro prism designs have the added benefit of folding the optical path so that the physical length of the binoculars is less than the focal length of the objective and wider spacing of the objectives gives a better sensation of depth. Roof-prism The first prism of the roof prism system has one surface that does not feature total internal reflection, resulting in the loss of some light. To minimize this loss, it is necessary to apply coating on the surface to raise reflectivity. Also, to produce the roof surface of the second prism that delivers sharp images without a double image or flare, highly advanced technology to process its edge precisely is required. Because the optical path of the roof prism binoculars is straight, there can be a slimmer and compact body. PORRO ROOF 7
Icon explanation Porro prism type binocular. It uses 90 degrees prisms to turn the image the right way up. Offers great optic quality at the cost of a big size and weight. Roof prism type binocular. It uses a roof-shaped double prism to reflect the light and turn the image the right way up. Designed to let the light go in a straight line from the object lens to the eyepiece lens, this type is more slim and small sized. A binocular that uses the BaK4 prism which grant a high reflective strength. It provides a brighter and clear image. Uses an environment friendly Eco-glass. Fully multi-coated. The whole lenses and prism surface are multi coated to greatly reduce the light loss. Multi coated. Glass-to-air surface of the lens are multi coated to reduce light. Magenta coating. Mono-layer coating to reduce light loss. Phase coating. Special coating to correct the phase shift in roof prism type of binoculars guranteeing greater image resolution and contrast. 8
Center focus. Left and right eyepiece focus is adjusted at the same time with the focus ring in the center. Binoculars with an apparent field of view of 65* degrees or higher. *New calculation sets it to 60 degrees or greater. This model can change the magnification while observing an object. Center diopter adjustment system. In this type the diopter adjustment ring is before the focus ring. Easy to use. High eye relief. Model with 15mm or greater eye relief, it helps to avoid tiring eyes even in case of prolonged use and provides a large field of view also while using glasses. It makes easier to avoid dirt and prevents fogging due to the cold. Click diopter adjustment. Diopter adjustment ring with clicks to avoid changing even one degree after you have perfectly adjusted the diopter. Twist-up eye-cups. Easy to use even for people wearing glasses. Rubber exterior. Impact resistant, easy to grip. Waterproof design that prevents water to get inside the lens barrel even when dampened by rain or snow. 9
Choose your world How to choose the right binoculars for the right activity Birdwatching Binoculars with magnification 7x to 8x with good relative brightness. Wide field of view will help to find bird quickly and easily. Suggested Binoculars: Kenko series, Ultra View EX series Ultra view series, Mirage series Sports Watching To watch football and baseball games the best would be binoculars with magnification 7x to 10x and with a wide field of view. Also zoom type binoculars will help you to change magnification according to watching scenes. Suggested Binoculars: Artos series, Ultra View EX OP 10x32W DH II Ultra View Zoom series, Mirage series
Hiking & Travel In case of snow or rain, light, compact and waterproof type is mostly suggested. Suggested Binoculars: Kenko series, Ultra View EX OP 8x32 DH II, New SG series Ultra View series, Mirage series Concert & Outdoor Events Compact pair of binoculars with magnification of 6x to 8x. Binoculars with good relative brightness will help to observe in dark conditions. Suggested Binoculars: New SG series, Ultra View series Star Watching For astronomical purposes a pair of binoculars with a large diameter of objective lens like 40mm or more and with wide open pupil. In case of snow or rain, waterproof type is mostly suggested. Suggested Binoculars: Kenko series, Ultra View EX 8x42 and 10x42 DH Artos 8x42 W, Mirage 10x50 W
Premium roof prism binoculars with superior optical performance, durability, shock resistance and outstanding grip sensation. The ultimate choice for a customer who want to enjoy the highest grade of watching experience. Phase coated Phase coated roof prism with reflective silver coating. Fully muti-coated lenses for maximum light transmission and brightness. 12 Fully waterproof waterproof and nitrogen filling to avoid fogging even in the worst weather condition.
This luxurious optical system offers fully multi-coated lenses combined with a high reflective silver mirror coated prism as well as a phase correction coating for high contrast and bright images. A combination of great brightness and high resolving power. A perfect waterproof body, with an open hinge ergonomic design. This model adopts a precise and easy to use center vision adjustment system; the pullout diopter adjustment system prevent your setting to be inadvertently changed. The high quality and refinement of this binoculars will give you great satisfaction whatever scene you are looking. OP 8X42 DH 4961607 011898 OP 10X42 DH 4961607 011904 l Large and easy to use focus ring l Durable die-cast aluminum body l Waterproof performance: Up to 1m depth (10 minutes), as for JISB7261 (ISO9022-8) test with an estimated 7 IPX (10 minutes) l Case and strap included Model (Degrees) at 1000m Brightness Shortest focusing distance Weight OP 8x42 DH 7.5 131m 27.5 2.5m 850g 164x58x140 mm OP 10x42 DH 6 105m 17.6 2.5m 850g 164x58x140 mm Size 13
High performance multipurpose roof prism binoculars. Enjoy this high grade binocular a sports event, bird watching or outdoor trip. Fully muti-coated lenses for maximum light transmission and brightness. Fully waterproof waterproof and nitrogen filling to avoid fogging even in the worst weather condition. Large easy to use center focus ring and extremely durable and lightweight glass-fiber reinforced poly-carbonate body. 14
ULTRA LIGHTWEIGHT birding binoculars. At just 455g/16.04oz.! The world's lightest* pair of 8x32 binoculars AVALIBLE! The easy grip of the open hinge design body with the compactness of the 32mm objective lens models. With reinforced lightweight plastic body and a waterproof spec this model can be used in the field without worries. Model (Degrees) at 1000m Brightness *as of 01/01/2016 according to Kenko research l Waterproof performance: Up to 1m depth (10 minutes), as for JISB7261 (ISO9022-8) test with an estimated 7 IPX (10 minutes) l Lightweight reinforced plastic body l Large and easy to use focus ring l Case and strap included Shortest focusing distance Weight OP 8x32 DH II 7.5 131.1m 16 2.5m 455 g 138x52x127.3 mm OP 10x32W DH II 6.5 (Wide) 113.5m 10.2 2.5m 470 g 138x52x127.3 mm Size OP 8x32 DH II 4961607 002889 OP 10x32W DH II 4961607 002896 *only 10x32 model This 42mm objective fully multi-coated lenses and phase-correction coating provides a bright and clear field of vision. The center vision adjustment system grants a quick and easy precise adjustment. l Waterproof performance: Up to 1m depth (10 minutes), as for JISB7261 (ISO9022-8) test with an estimated 7 IPX (10 minutes) l Large and easy to use focus ring l Case and strap included Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 8x42 DH 7.5 131m 27.6 2.5m 660 g 131x51x148 mm 10x42 DH 6 105m 17.6 2.5m 650 g 131x51x144 mm Size 8X42 DH 4961607 002766 10X42 DH 4961607 002773 15
Standard porro prism binoculars series features a full waterproof and shock resistant easy to grip body. The high eye relief and the twist-up eye-cups make them perfect for outdoor sports event or ideal for general use. Fully waterproof waterproof and nitrogen filling to avoid fogging even in the worst weather condition. Wide field of View Twist up eye-cups and high eye-point design 16
Each of these 42mm objective lens models offer a wide field of view of over 65, whether you are trying to view the nebula and stars spread in the sky or follow a sports game with everyone running around the stadium, enjoy the field view provided by these models without any worries. l Waterproof performance: Up to 1m depth (10 minutes), as for JISB7261 (ISO9022-8) test with an estimated 7 IPX (10 minutes) l Large and easy to use focus ring l Durable die-cast aluminum body l May be mounted to a tripod using an adapter holder (sold separately) l Case and strap included 8X42 W 4961607 031094 10X42 W 4961607 031100 12X42 W 4961607 031117 Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 8X42 W 8.2 (wide) 143.4m 27.6 5.5m 770 g 138.5x73x176 mm 10X42 W 6.6 (wide) 115.3m 17.6 5.5m 770 g 138.5x73x176 mm 12X42 W 5.5 (wide) 96.1m 12.3 5.5m 770 g 138.5x73x176 mm Size Since the release the Artos series had received great appreciation. Their high water resistance make them especially fitted for field use and can be used without worries even for night time astronomical observation or in sudden rain during bird-watching. l Waterproof performance: Up to 1m depth (10 minutes), as for JISB7261 (ISO9022-8) test with an estimated 7 IPX (10 minutes) l Large and easy to use focus ring l Durable die-cast aluminum body l May be mounted to a tripod using an adapter holder (sold separately) l Case and strap included 7X50 4961607 031124 10X50 W 4961607 031131 12X50 W 4961607 031148 Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 7X50 6.5 (wide) 113.6m 50.4 10m 880 g 165x77x185 mm 10X50 W 6.6 (wide) 115.3m 25 8.2m 880 g 165x77x185 mm 12X50 W 5.5 (wide) 96.1m 17.6 7.5m 880 g 165x77x185 mm Size 17
This multipurpose standard porro binoculars offer great versatility for your general usage. Large focus ring for precise and easy adjustment. Fully waterproof waterproof and nitrogen filling to avoid fogging even in the worst weather condition. Multi-coated glass-to-air surface of the lenses to reduce light loss. 18
Standard 30mm objective lens model with great compactness. This waterproof spec model can be used in the field without worries. l Waterproof performance: Up to 1m depth (10 minutes), as for JISB7261 (ISO9022-8) test with an estimated 7 IPX (10 minutes) l Large and easy to use focus ring l May be mounted to a tripod using an adapter holder (sold separately) l Case and strap included 8X30 WP 4961607 020401 10X30 WP 4961607 020418 Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 8x30 WP 7.0 122.3m 14.1 3m 450g 117x60x160mm 10x30 WP 5.5 96.1m 9 3m 460g 117x60x160mm Size 19
This standard grade multipurpose zoom models let you choose the magnification power that best suits your needs. Large focus ring for precise and easy adjustment. Zoom Change the magnification by yourself whenever you need. Multi-coated glass-to-air surface of the lenses to reduce light loss. 20
A compact and easy to use standard zoom pair of binoculars, change their magnification by yourself to match your needs. 7-15x35 4961607 002803 l May be mounted to a tripod using an adapter holder (sold separately) l Case and strap included Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 7~15x35 5.6 ~3.7 97.8~64.6m 25~5.4 10m 700 g 130x77x168 mm Size The zoom handling use the eyepiece lever one-touch system. The low zoom ratio make possible to some extent to see in low light condition. 8-20x50 4961607 002810 l May be mounted to a tripod using an adapter holder (sold separately) l Case and strap included Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 8~20x50 4.5 ~2.9 78.6~50.6m 39~6.2 10m 900 g 185x77x180 mm Size 21
Black waterproof and solid body mid grade compact roof binoculars. A model easy to carry on outdoor trips, travels and events. Multi-coated glass-to-air surface of the lenses to reduce light loss. Easy to use Twist-up eyecups. Impact resistant, easy to grip rubber exterior. 22
This compact roof prism model water proof body can be used for any scenery you would like to watch, the BaK4 prism grants a brighter and clear field of vision. l Waterproof performance: Up to 1m depth (10 minutes), as for JISB7261 (ISO9022-8) test with an estimated 7 IPX (10 minutes) l Case and strap included 8X25 DH WP 4961607 020425 10X25 DH WP 4961607 020432 Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 8X25 DH WP 6.6 115.3m 9.6 3m 340 g 117x43,5x109 mm 10X25 DH WP 5.4 94.3m 6.25 3m 340 g 117x43,5x109 mm Size 23
Entry level porro binoculars, suitable for people starting their nature watching experience. Classic design easy to get used by beginners. Center focus ring for simultaneous adjustment. It can be attached tripod adapter holder compact. 24
This entry level binoculars are ours suggested models for people starting their nature watching experience. l May be mounted to a tripod using an adapter holder (sold separately) l Large and easy to use focus ring l Case and strap included Model (Degrees) at 1000m Brightness Shortest focusing distance Weight 8X42 6.8 118.8m 27.6 5.5m 650 g 140x57x190 mm 7x50 6.8 118.8m 50.4 8m 790 g 167x65x198mm 10x50 W 6.5 (Wide) 114m 25 6m 790 g 167x65x198mm 12x50 W 5.5 (Wide) 96.1m 17.6 12m 810 g 167x65x198mm 16x50 3.5 61.1m 9.6 10.7m 820 g 167x65x198mm Size *only 10x50 W and 12x50 W models 8X42 4961607 031728 7X50 4961607 031681 12X50W 4961607 031728 10X50W 4961607 031698 16X50 4961607 031711 25
Technical data table Model Kenko OP 8x42 DH Kenko OP 10x42 DH Ultra View Ex OP 8X32 DH II Ultra View Ex OP 10X32 W DH II Ultra View EX 8x42 DH Ultra View EX 10x42 DH Artos 8X42 W Artos 10X42 W Artos 12X42 W Artos 7X50 Artos 10X50 W Artos 12X50 W Ultra View 8X30 WP Ultra View 10X30 WP Ultra View 7~15x35 Ultra View 8~20x50 New SG 8X25 DH WP New SG 10X25 DH WP Mirage 8x42 Mirage 7x50 Mirage 10x50 W Mirage 12x50 W Mirage 16x50 Magnification Objective lens effective diameter Coating Apparent field of view at 1000m Exit pupil diameter 8 42mm Full multi-coating 7.5 60 131m 5.25mm 10 42mm Full multi-coating 6 60 105m 4.2mm 8 32mm Full multi-coating 7.5 60 131.1m 4.0mm 10 32mm Full multi-coating 6.5 (Wide) 65 113.5m 3.2mm 8 42mm Full multi-coating 7.5 60 131m 5.25mm 10 42mm Full multi-coating 6 60 105m 4.2mm 8 42mm Multi-coating 8.2 (wide) 65.6 143.4m 5.3mm 10 42mm Multi-coating 6.6 (wide) 66 115.3m 4.2mm 12 42mm Multi-coating 5.5 (wide) 66 96.1m 3.5mm 7 50mm Multi-coating 6.5 45.5 113.6m 7.1mm 10 50mm Multi-coating 6.6 (wide) 66 115.3m 5mm 12 50mm Multi-coating 5.5 (wide) 66 96.1m 4.2mm 8 30mm Multi-coating 7.0 52.1 * 122.3m 3.75mm 10 30mm Multi-coating 5.5 52.3 * 96.1m 3mm 7~15 35mm Magenta coating 5.6 ~3.7 39.2 ~ 55.5 97.8 ~ 64.6m 5~2.3mm 8~20 50mm Magenta coating 4.5 ~2.9 36 ~ 58 78.6 ~ 50.6m 6.2~2.5mm 8 25mm Multi-coating 6.6 49.5 * 115.3m 3.1mm 10 25mm Multi-coating 5.4 50.5 * 94.3m 2.5mm 8 42mm Magenta coating 6.8 54.4 112m 5.25mm 7 50mm Magenta coating 6.8 47.6 118.8m 7.1mm 10 50mm Magenta coating 6.5 (Wide) 65 114m 5mm 12 50mm Magenta coating 5.5 (Wide) 66 96.1m 4.2mm 16 50mm Magenta coating 3.5 56 61.1m 3.1mm 26
Brightness Eye relief Shortest focusing distance Weight Size Production country Product number 27.6 18mm 2.5m 850g 164x58x140 mm Japan 4961607 011898 13 17.6 18mm 2.5m 850g 164x58x140 mm Japan 4961607 011904 13 16 18mm 2.5m 455g 138x52x127,3 mm Philippine 4961607 002889 15 10.2 18mm 2.5m 470g 138x52x127,3 mm Philippine 4961607 002896 15 27.6 18mm 2.5m 660g 131x51x148 mm Philippine 4961607 002766 15 17.6 18mm 2.5m 650g 131x51x144 mm Philippine 4961607 002773 15 27.6 18mm 2.5m 770g 138,5x73x176 mm Philippine 4961607 031094 17 17.6 18mm 2.5m 770g 138,5x73x176 mm Philippine 4961607 031100 17 12.3 18mm 2.5m 770g 138,5x73x176 mm Philippine 4961607 031117 17 50.4 18mm 2.5m 880g 165x77x185 mm Philippine 4961607 031124 17 25 18mm 2.5m 880g 165x77x185 mm Philippine 4961607 031131 17 17.6 18mm 2.5m 880g 165x77x185 mm Philippine 4961607 031148 17 14.1 17mm 3m 450g 117x60x160 mm Philippine 4961607 020401 21 9 18mm 3m 460g 117x60x160 mm Philippine 4961607 020418 21 25~5.4 20~16mm 10m 700g 130x77x168 mm Philippine 4961607 002803 21 39~6.2 20~15mm 10m 900g 185x77x180 mm Philippine 4961607 002810 21 9,6 14mm 3m 340g 117x43,5x109 mm China 4961607 020425 23 6.25 14mm 3m 340g 117x43,5x109 mm China 4961607 020432 23 27.6 15.2mm 5.5m 650g 140x57x190 mm Philippine 4961607 031728 25 50,4 17.8mm 8m 790g 167x65x198 mm Philippine 4961607 031681 25 25 12.7mm 6m 790g 167x65x198 mm Philippine 4961607 031698 25 17.6 10.3mm 12m 810g 162x65x198 mm Philippine 4961607 031704 25 9.7 12.1mm 10.7m 820g 167x65x198 mm Philippine 4961607 031711 25 Page 27
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