Abstract: The present disclosure provides a device for dioptric adjustment of a plurality of telescopic lenses against a focal plane array. The device includes a hollow cylinder developed onto a housing. In addition, the housing includes a plurality of pins. The device includes the focal plane array affixed with a support structure. Further, the device includes a barrel body. The barrel body includes a plurality of slots. Further, each of the plurality of pins is inserted in a slot of the plurality of slots of the barrel body. Furthermore, the device includes a dioptric adjusting knob coupled to the plurality of telescopic lenses with facilitation of the barrel body. Furthermore, the dioptric adjusting knob is manually rotatable about a longitudinal axis of the barrel body for displacing the plurality of telescopic lenses to thereby adjust an optical setting of the spotting scope.

Abstract: The present disclosure provides a muzzle end adapter for performing bore sighting of a small caliber gun. The muzzle end adapter includes a plurality of hand levers. In addition, the muzzle end adapter includes a main operating shaft connected rigidly with a first hand lever. Also, the muzzle end adapter includes a cylindrical member connected at one end of the main operating shaft. Moreover, the muzzle end adapter includes a plurality of centering devices. The plurality of centering devices includes a plurality of jaws. The plurality of jaws includes a plurality of equiangular spaced jaws centered around a pivot pin. Further, the muzzle end adapter includes a disk. Furthermore, the disk includes a tapered hole connected with the muzzle end adapter.

Abstract: The present disclosure provides a device for adjusting inter-pupillary distance between eyepieces of imaging systems. The device includes a pinion gear. The pinion gear is mounted on a first pin. The device includes two carrier plates. Each of the two carrier plates having gear teeth on a first portion of a side. The gear teeth on the two carrier plates are in mesh with the pinion gear. The two carrier plates are positioned parallel and opposite to one another. The device includes two focal plane arrays. Each of the two focal plane arrays is rigidly affixed with a carrier plate of the two carrier plates and movably supported over other carrier plate of the two carrier plate. The device enables inter-pupillary distance adjustment between eyepieces without causing skew or distortion of image.