Abstract: A selectable fixed-focus binocular that is highly functional and simple to operate for the end consumers. The binocular combines the close and fine focusing advantages of a traditional binocular with the ease of use offered in a fixed-focus or focus-free style unit to make a versatile, user-selectable focus style binocular. The end-user can use the binocular in a typical, manual focus mode or manipulate the control knob to transition for use as a simple, fixed-focus unit.

Abstract: A method and system for adjusting focusing length to enhance vision of a user. A method for adjusting focusing length includes controlling an object to be displayed and adjusting a focusing length indicating distance to a lens from a virtual surface where eyes of user are located by changing at least one optical property of then lens based on vision setting information while an object is displayed.

Abstract: Interpupillary distance of binoculars is adjusted by relatively rotating a pair of lens barrels about a predetermined axis. A click position setting mechanism sets a click position at an arbitrary angle of rotation of said pair of lens barrels and includes a rotating member rotatable about the predetermined axis. A lock/unlock member locks and unlocks the rotation of the rotating member.

Abstract: The present disclosure discloses an optical fiber welding machine, including a device for butt joint of the optical fiber's core. The said device comprises a base and a number of units with V-shape groove. The base and the units are shaped respectively. The said units are mounted on the base fixedly. Comparing with the traditional overall molding device for butt joint of the optical fiber's core, the disclosed embodiment splits said traditional device, which has complicated structure and high accuracy requirements, into a base and a number of V-shape groove units, thus simplifies the shape of the components, which are shaped respectively, so as to facilitate the purpose of molding mould and shaping components, and then the v-shape groove units are mounted on the base. After completion of assembly, a v-shaped slot is grooved on top of each v-shape groove unit to ensure enough precision. The disclosed embodiment reduces both the mold manufacturing cost and the molding cost of components.

Abstract: A lens apparatus is disclosed that can include at least one piece of optical film comprising two or more major edges, a front light-emitting side, a back light-receiving side and four corner regions, each having one or more associated minor edges defining one or more corner cuts that define a corner cutout. The lens apparatus may also include an edge truss configured on the two or more major edges, wherein each edge truss may be disposed towards the back light-receiving side of the at least one piece of optical film. Each edge truss may include one or more sides configured from a corresponding fold in the at least one piece of optical film, wherein at least one of the one or more sides of each edge truss may be configured to impart support to the lens apparatus and to resist deflection of each edge truss.

Abstract: An optical device for viewing distant objects. The device includes an objective system and at least one ocular and achieves a magnifying power of greater than 0.6 mm?1 times the entrance pupil diameter in millimeters with an exit pupil of at least 2 mm Images from the objective system are detected by a sensor, processed and recorded. The images are displayed on a display which is observed by the user through one or more oculars. The optical device works well at low light levels. The device also has a slide mechanism for adjusting the interpupillary distance between the oculars.

Abstract: A method of making a rifle scope that makes use of a longitudinal base plate piece and a mating, closure housing piece. Optical assemblies are attached to the longitudinal base plate and the mating, closure housing piece is attached to the longitudinal base plate and the housing piece and base plate are fastened together.

Abstract: The invention relates to improving optical properties of optical instruments with variable magnification, such as zoom binoculars, reducing the weight thereof, and enabling the user to change magnifications quickly. The invention provides an optical instrument with a focal length-varying lens 4 disposed on the optical axis between an objective lens 7 and an eyepiece 3, further having an adjusting lens 5 for adjusting optical properties when the focal length-varying lens is in an area to provide high magnification. The adjusting lens is supported so that it is capable of moving between a location on the optical axis and a location off the path of light beams. Interlocked with a magnification-varying mechanism that controls the position of the focal length-varying lens, the adjusting lens is moved to the on-the-axis location when the focal length-varying lens is in an area to provide high magnification, and to the off-the-axis location when low magnification.

Abstract: Binoculars with an integrated laser light source capable of illuminating the optical field of view through the binoculars to provide concise and effective viewing under limited visibility conditions. The integrated light source generates a coherent laser light beam that has variably adjustable divergence.

Abstract: An optical device for viewing distant objects. The device includes an objective system and at least one ocular and achieves a magnifying power of greater than 0.6 mm?1 times the entrance pupil diameter in millimeters with an exit pupil of at least 2 mm. Images from the objective system are detected by a sensor, processed and recorded. The images are displayed on a display which is observed by the user through one or more oculars. The optical device works well at low light levels. The device also has a slide mechanism for adjusting the interpupillary distance between the oculars.

Abstract: Providing a pair of binoculars that is able to prevent diopter from being changed after adjusting diopter difference by pushing down the focus knob after adjusting diopter difference so as not to touch the operating knob, and able to prevent the focus position from being changed after adjusting focus position by pulling out the focus knob to create a focus lock state after adjusting focus position.

Abstract: A method for focusing and diopter adjustment in a binocular telescope, in which, for the purpose of diopter adjustment, optical focusing elements (12) in the two telescope tubes (2, 3) can be displaced relative to one another, is distinguished by the fact that, as a result of rotation of a focus drive knob (5), both focusing elements (12) are displaced simultaneously by equal distances via a focus drive, the displacement of at least one of the focusing elements (12) can be locked (13, 14), and, as a result of rotation of the focus drive knob (5), while overcoming a frictional force in the focus drive to the locked focusing element (12), only the unlocked focusing element (12) is displaced.

Abstract: A vision aid in the form of telescopic spectacles has two lens systems, which each comprise at least one objective lens (70) and one eyepiece (71). An autofocussing element which changes the focal length of the lens systems for sharp focussing thereof according to the distance of the telescopic spectacle from the object is assigned to the lens systems. Furthermore, an element for changing the magnification factor by changing the focal length of the lens systems (“zoom”) and finally an element for matching the parallax between the lens systems of the vision aid to the focal length which has been set according to the distance of the telescopic spectacles from the object are assigned to the lens systems. The parallax is adapted using adjustable optical elements (11) which are located in the beam path of the lens systems, with which elements the angle (13) between the beam paths (14) running from the lens systems (1) to the object can be changed.

Abstract: The invention aims at providing a pair of binoculars making it possible to easily perform a focusing operation and a diopter adjustment, and efficiently perform an assembling operation. The present invention provides a pair of binoculars having a pair of supporters for supporting adjustment lenses provided between a pair of ocular optical systems and a pair of objective optical systems so as to be capable of moving forward and backward along the optical axis, a focusing gear for performing a focusing operation by moving said pair of supporters forward or backward at the same time in the direction of optical axis, a diopter adjuster for performing a diopter adjustment by moving one supporter forward or backward in the direction of optical axis as keeping the other supporter stationary, and a focusing and diopter adjusting unit having a changeover gear for changing over the focusing gear and the diopter adjuster to each other.

Abstract: A play-free rotary mounting for a drive roll held on stop surfaces in the axial direction on a cylindrical body, wherein V-shaped annular grooves with an opening angle V are provided at least in one of the end faces of the drive roll and the stop surface located opposite them on the body, V-shaped bearing shells with at approximately identical opening angles and approximately identical leg length are inserted into the annular grooves, the vertex diameters of the annular grooves differ from the vertex diameters of the bearing shells. Balls with a diameter matched to the opening width of the bearing shells are inserted into the bearing shells. At least one of the stop surfaces can be adjusted in the axial direction in order to clamp the drive roll in. Instead of different vertex diameters, different opening angles can also be provided for the annular grooves and opening angles for the bearing shells.

Abstract: In an optical viewer instrument with a photographing function, there is provided a telescopic lens system for observing objects, and a digital camera system including a solid-state image sensor and a photographing lens system associated with each other such that an object is formed as a photographed image on the solid-state image sensor through the photographing lens system. A manually-operable focussing mechanism is associated with the telescopic lens system and the photographing lens system such that the object is brought into focus through the telescopic lens system, and such that the object is brought into focus through the photographing lens system. Optical parameters are selected such that predetermined conditions are fulfilled, whereby the focussing of the telescopic lens system and the focusing of the photographing lens system can be suitably and properly performed by the focussing mechanism.

Abstract: An optical device comprises a lens barrel and a casing. The casing has two casing sections that are movable relative to each other. A distribution cable is provided in the casing, and extends between the casing sections. The distribution cable is loosely wound around the lens barrel, whereby a movement of the distribution cable, caused by a relative movement of the casing sections, is absorbed by the loosely wound portion of the distribution cable.

Abstract: A housing for a magnification loupe is provided having a body portion for an eyepiece lens and a nose portion for an objective lens. The body portion for the eyepiece lens includes outer circumferential threads over which the objective nose portion fits. The objective nose portion includes a pin slot defining an arc across the body of the nose. The arc is configured such that a pin may be secured through the holes in the nose piece to co-act with the threads of the eyepiece body such that radial movement is prohibited.

Abstract: A housing for a magnification loupe is provided having a body portion for an eyepiece lens and a nose portion for an objective lens. The body portion for the eyepiece lens includes outer circumferential threads over which the objective nose portion fits. The objective nose portion includes a pin slot defining an arc across the body of the nose. The arc is configured such that a pin may be secured through the holes in the nose piece to co-act with the threads of the eyepiece body such that radial movement is prohibited.

Abstract: A binocular, including a right and left lens barrels respectively having a right and left telescope optical systems, is provided with a space occupied by a movement member that moves lenses to vary at least magnification so as to reduce the size of the binocular. First and second lens sliders, connected to a first and second lens, are moved along an optical axis direction of the telescope optical system so that the first and second lens, are moved along the optical axis direction. The first and second lens sliders move inside the space defined by the right and left telescope optical systems and a flat supporting plate.

Abstract: A reflector telescope (10) includes at least one moveable secondary mirror assembly, thereby allowing control over the distance between the primary and secondary mirrors. A preferred telescope tube assembly includes a plurality of frame elements, between which is defined an optical path. An inner end of the telescope tube assembly supports a primary mirror assembly (200). In a preferred version of the reflector telescope, an inner secondary mirror assembly (300) and an outer secondary mirror assembly (400) are carried by the telescope tube assembly. Each secondary mirror assembly includes a secondary mirror and optical equipment such as an eyepiece. The secondary mirror assemblies can be slid along the frame elements of the telescope tube assembly, allowing the distance between the primary and secondary mirrors to be controlled.

Abstract: A connecting member is provided with a first, a second and a third arm which radially extend. A first hole is formed at an end of the first arm, and a second hole is formed at an end of the second arm. The centers of the first and second holes respectively coincide with optical axes of objective lenses. A pair of eyepiece groups are held by a pair of holders. The holders are rotatably held by the first and second holes, so that an interpupillary adjustment is carried out. A rotation ring axle is threadably engaged with a third hole formed at an end of the third arm. A guide shaft passes through a junction of the first, second and third arms. The connecting member is movable along optical axes of the eyepieces, so that a focusing operation is carried out.

Abstract: A pair of binoculars includes a compact focusing mechanism providing an open reach-through space between the body tubes of the binoculars with an enhanced area for the user to grasp and hold each body tube. The focusing mechanism further provides for adjustment of the body tube spacing without affecting focusing. The focusing mechanism includes a compact focusing knob structure situated on an outside of an articulated bridge connecting the body tubes and used for adjusting and maintaining a desired distance between the tubes. The focusing mechanism includes respective arms extending from the focusing knob to each of the body tubes, the ends of the levers riding on the inside of a conically shaped plunger coaxial with a pivot point of the bridge so that adjusting a spacing between the body tubes does not affect focusing. When positioned inwardly, the focusing knob produces a longitudinal movement of the plunger to effect focusing of both focusing elements simultaneously.

Abstract: A binocular includes a hood, an eyepiece lens panel, and an objective lens panel. The hood has top, left side, and right side portions that are integrally formed. The left and right side portions have free edges that extend downwardly from the top to form an open bottom. The open bottom of the hood allows the hood to flex when an outwardly directed force is applied so that the left and right sides can be further separated from one another. This separation allows the eyepiece lens panel and the objective lens panel to be inserted within the hood during assembly of the binoculars to be held by the hood. The eyepiece lens panel has a flat plate frame and two lenses that are integrally formed as a one piece construction. The objective lens panel also has a flat plate frame and two lenses that are also integrally formed as one piece. The hood may further include alignment members to secure and align the eyepiece lens panel.

Abstract: A method is designed to adjust the distance between the central axes of two ocular lenses of an optical instrument. The method involves the use of a link mechanism to actuate two movable prisms and the two ocular lenses of the optical instrument to move respectively along a base surface such that the optical axes of effective diameters of the two movable prisms are coaxial with the optical axes of the corresponding ocular lenses.

Abstract: A housing for a magnification loupe is provided having a body portion for an eyepiece lens and a nose portion for an objective lens. The body portion for the eyepiece lens includes outer circumferential threads over which the objective nose portion fits. The objective nose portion includes a pin slot defining an arc across the body of the nose. The arc is configured such that a pin may be secured through the holes in the nose piece to co-act with the threads of the eyepiece body such that radial movement is prohibited.

Abstract: A large (10's of meters) aperture space telescope including two separate spacecraft—an optical primary objective lens functioning as a magnifying glass and an optical secondary functioning as an eyepiece. The spacecraft are spaced up to several kilometers apart with the eyepiece directly behind the magnifying glass “aiming” at an intended target with their relative orientation determining the optical axis of the telescope and hence the targets being observed. The objective lens includes a very large-aperture, very-thin-membrane, diffractive lens, e.g., a Fresnel lens, which intercepts incoming light over its full aperture and focuses it towards the eyepiece. The eyepiece has a much smaller, meter-scale aperture and is designed to move along the focal surface of the objective lens, gathering up the incoming light and converting it to high quality images.

Abstract: A housing for a magnification loupe is provided having a body portion for an eyepiece lens and a nose portion for an objective lens. The body portion for the eyepiece lens includes outer circumferential threads over which the objective nose portion fits. The objective nose portion includes a pin slot defining an arc across the body of the nose. The arc is configured such that a pin may be secured through the holes in the nose piece to co-act with the threads of the eyepiece body such that radial movement is prohibited.

Abstract: A binocular has a focusing mechanism and a convergence angle correction mechanism. Focusing is achieved by moving an objective optical system or eyepiece optical system along an optical axis. The convergence angle correction mechanism, which is interlocked with the focusing mechanism, decenters an element of the objective optical system translationally with respect to the optical axis. The translational decentering is achieved by moving the objective optical element in a direction at an angle to the optical axis.

Abstract: A binocular includes two telescope systems. Each telescope system includes an objective system, an erecting system, and an eyepiece system. The binocular also includes a focus adjusting actuator and a focus adjusting knob, as well as a diopter correction actuator and a diopter correction knob. A guide member guides the focus adjusting actuator and the diopter correction actuator to be aligned along an optical axis of one of the telescope systems.

Abstract: A binocular including two telescope systems with parallel axes, eyepiece frames having a concave surface facing a user, adjustable eye cups with a secure locking mechanism, operation controls placed between the telescope systems, a focus adjustment mechanism, a diopter correction mechanism, and a magnifying-power-varying mechanism. The focus adjustment mechanism and diopter correction mechanism are arranged coaxially. The magnifying-power-varying mechanism includes rotatable cam rings and guide rings connected by a single connecting belt that moves perpendicular to the optical axes to rotate the cam rings. The connecting belt is supported and held in position so that it does not bind. The position of magnifying-power-varying lenses can be adjusted. During assembly, the magnifying-power-varying lenses can be mounted in the guide rings in a number of positions by rotating the lens frames holding the lenses about the optical axis and inserting sliders in linear guide grooves.

Abstract: A binocular telescope provided with a pair of left and right lens-barrels respectively containing optical systems, a first guide shaft for supporting these lens-barrels in such a manner that the lens-barrels can slide in a direction perpendicular to the optical axes of the optical systems and can rotate, a second guide shaft for restraining the relative tilt of the lens-barrels around this first guide shaft in such a manner that the optical axes of the left and right optical systems become parallel to each other, a first rib for holding both ends of the first guide shaft by fitting upper and lower covers to each other, and a second rib for restraining the tilt of the optical axes of the entire lens-barrels around the first guide shaft.

Abstract: A method and apparatus to correct and eliminate optical anomalies and geometrical distortions in an intensified imaging system, specifically a night vision system. An image is received from the original objective lens assembly of an unintensified imaging system which, presumably, has been designed to produce images sized in accordance with the image sensor size of its host camera or camcorder. The format matching lens assembly receives the image from the original objective lens system and magnifies it so that it is output onto the entire circular active area of a mechanically inserted image intensifier. Having received an image across its entire circular active area, the image intensifier is able to amplify or intensify the image using the received light without creating any optical distortions. Once intensified without distortion, the image must be still further modified to fit its original format size.

Abstract: Binoculars which can adjust the optical axes of optical systems by moving at least one lens groups of objective lens groups and eye piece groups in a plane approximately perpendicular to the optical axes of the lens groups and further independently adjust the optical axes of the optical systems in a linear direction and in the direction approximately perpendicular to the linear direction by moving, one lens groups of the objective lens groups and the eye piece groups on the plane approximately perpendicular to the optical axes of the lens groups approximately in the linear direction and moving the other lens groups of the objective lens groups and the eye piece groups on the plane approximately perpendicular to the optical axes of the lens groups approximately in the linear direction, whereby the optical axis between a pair of the right and left optical systems of the binoculars can be easily adjusted.

Abstract: The present invention is a multifunctional night vision monocular that is adapted for use by a soldier as a hand-held spotting scope, a helmet mounted scope, a head mounted scope, and a weapon mounted scope depending upon circumstances and the needs of the soldier. The night vision monocular is a self-contained unit capable of carrying its own power source. A universal mount on the bottom of the night vision monocular enables either a helmet mounting adaptor or a weapon sight mount to be quickly added to the monocular. The night vision monocular contains a GEN III image intensifier tube positioned between an objective lens assembly and an eyepiece lens assembly. The housing of the night vision monocular opens in a plane perpendicular to the optical axis, thereby enabling easy access to the various optical elements for repairs, maintenance and replacement. A reduced number of wire leads are used within the night vision monocular thereby reducing manufacturing costs and improving reliability.

Abstract: A pair of binoculars includes a first optical system; a second optical systems; a light rays separators that extracts from the first optical system a portion of light rays that pass through the first optical systems; a device for examining the extracted light rays; a device for adjusting parts of the first and second optical systems based on a results of the examination of the extracted light rays; and a light reducer located in the second optical system for separating light rays equivalent to the light rays extracted by the light rays separator from the light rays passing through the second optical system.

Abstract: A mounting adapter for coupling a TV lens or other type of lens to a night vision device is provided. The mounting adapter is a longitudinal tubular member that has an exterior surface that tapers from a wider first end to a narrower second end. The interior surface of the wider first end includes a first threaded region to removably couple the mounting adapter to a night vision device. A second threaded region is located on the interior surface of the narrower second end for removably coupling a TV lens or other optical device to the mounting adapter. The mounting adapter defines a cavity for receiving a portion of an image intensifier tube, this cavity being located just past the first threaded region. At the end of the cavity there is defined an annular-shaped seat which abuts against the image intensifier tube when the mounting adapter is coupled to the night vision device.

Abstract: A binocular incorporates a focusing and diopter correction mechanism having a common shaft, whereby the diopter adjustment is performed by rotation of the shaft and the focusing operation is performed by axial movement of the shaft. The lens-moving portions of the focusing/diopter adjustment mechanism are in a cavity having an access hole, in which the shaft enters the access hole through a water-tight seal to control the lens-moving portions of the adjustment mechanism. The binocular also incorporates a strap attaching mechanism having a spring-loaded clip and groove, wherein a flanged pin provided to a strap end is pushed past the clip into the groove, and the clip returns under the bias of the spring to hold the flanged pin in the groove. Also included is an eyecup adjustment mechanism having two positions defined by click-stops, wherein the eyecups are not rotatable, but are longitudinally slidable relative to corresponding support barrels.

Abstract: In an eyepiece zoom lens having a lens configuration constituted by seven lenses in three groups, predetermined conditional expressions are satisfied so as to realize a zoom ratio of 3 while attaining a sufficient eye relief and ameliorating various kinds of aberration. The first lens group G.sub.1 is made stationary, whereas the second lens group G.sub.2 and the third lens group G.sub.3 are made as movable groups which, when changing the power, respectively move in directions opposite to each other on the optical axis while holding therebetween an object image which is formed between these two lens groups. Further, the eyepiece zoom lens is configured so as to satisfy the following conditional expressions:5<f.sub.1 /f.sub.m <7, 3.5<f.sub.2 /f.sub.m <4.5,-3.7<f.sub.3 /f.sub.m <-3, 0.1<S.sub.12 /f.sub.m <1.0, 6.0<S.sub.23 /f.sub.m <8.0,.nu..sub.1 <35, .nu..sub.2 <35, .nu..sub.

Abstract: A variable focus adapter is disclosed that comprises the combination of a ns and an aperture provided by a plate all lodged in a housing that is placed so that the lens is in proximity with each objective lens of a binocular arrangement to change the focal range from greater than 20 ft. to seven (7) ft. with a depth of field spanning from 5 to 15 ft.

Abstract: A binocular telescope includes adjustable optical components. The telescope has at least two telescope halves, respectively having an optical axis passing through an ocular and an objective. The adjustable optical components lie between the ocular and objective in a respective housing tube. The telescope has, between the two telescope halves, an axis that is essentially aligned parallel to the two optical axes, and in which a shaft body is arranged. The shaft body has a longitudinal slot in which an adjusting body, displaceable in the longitudinal axis of the shaft body, is arranged. This adjusting body is adjustable in the longitudinal direction from outside the telescope, its axial movement being coupled with the movable optical components for common focusing. A separate drive knob is arranged to change the axial position of one optical component in one telescope half to compensate for visual defects.

Abstract: An objective lens assembly provides up to 60 degrees field of view for the NVIS image intensifier goggle. A first lens subassembly positioned on the focal axis faces a external view and substantially corrects pupil aberrations in an aperture stop located after the first subassembly. A second lens subassembly is then located after the aperature stop on the focal axis. Color and field aberration corrections is provided while maintaining substantially high quality focus by a third lens subassembly. A lens element after the third lens subassembly on the focal axis flattens the image plane over the intensifier image format such that there results a format of up to 25 mm with a photocathode resolution for up to a 60 degree field of view.

Abstract: A binocular includes an eye-piece tube, a first lens system associated with the eye-piece tube for providing a base magnification as seen through the eye-piece tube, and an eye-piece module having a second lens system therein which is interchangeably installed in the eye piece tube for changing the position of the first lens system to a position of a preset increase in magnification.

Abstract: A coupling device and associated method for coupling an unassociated afocal optical assembly to a night vision apparatus in order to alter the optical power normally associated with the night vision. The coupling device includes two separate adapter rings that threadably connect to each other. The first adaptor ring is sized and shaped to threadably engage the night vision apparatus proximate the objective lens of the night vision apparatus. The second adaptor ring is sized and shaped to screw onto the output end of the afocal optical assembly. Accordingly, when the first adaptor ring is joined to the second adaptor ring, the output end of the afocal optical assembly is optically aligned with the objective lens of the night vision apparatus. Consequently, the afocal optical assembly enhances the optical power associated with the night vision apparatus.

Abstract: A binocular night vision device includes a pair of night vision monocular scopes which adjustably depend from a support frame in front of a user's eyes. The support frame includes an interpupillary distance adjustment mechanism which allows non symmetrical placement of the monocular scopes to better achieve binocular vision with depth perception. Also, the adjustment mechanism allows adaptive duplicative use of identically the same component parts of the device on both the left and right sides of the support frame so that the number of different parts required for the device is reduced.

Abstract: A monocular telescope in which the beam path is so laid out that the casing may be flat in the direction of view, and the optical axis of the beam path in the casing describes a somewhat rectangular route, and in which the telescope has a view finder beam path intesecting with the telescope beam path in the users eye.

Abstract: Binoculars having a central device for focusing and diopter adjustment wherein the diopter adjusting wheel is integrated into the face of the focusing drive wheel, whereby the focusing and the diopter adjustment can be performed independently of each other.

Abstract: Binoculars capable of simultaneous individual focus and simultaneous individual focus mechanisms therefor are discussed. The binoculars of the present invention are preferably offset hinged in the bridging portion to accommodate various users and for compactness. In addition, the binoculars of the present invention simulate the ease of center focus and combat parallax that results from misalignment of the optical axis and the mechanical axis of each binocular tube.

Abstract: In binoculars employing a pair of telephotographic optical systems with their respective optical axes being arranged in parallel to each other, the telephotographic optical systems having a lens group for focusing, respectively, and at least one of the telephotographic optical systems having a lens group for diopter-adjusting; first shaft member for simultaneously moving each lens group for focusing in an optical axis direction; and second shaft member for moving the lens group for diopter-adjusting in the optical direction; wherein the first shaft member and the second shaft member are arranged coaxially. Thus, it becomes possible to adjust a diopter-difference and a difference of eye contact positions by means of a single mechanism and to easily adjust focusing with a simple arrangement.

Abstract: A pair of binoculars in which the ocular abridgements are connected through a bridge and can be activated through a center drive. The center drive comprises a rotatable knurled element and a guide pin, whereby the center drive serves customary adjustment of the focus. A Fix-Focus-Adjustment is provided by a knurled ring of the guide pin, whereby conventional focus adjustment is released by way of a knurled ring and the stop is neutralized with a stop ring.