Auxiliary optical system

An auxiliary optical system installed on a telescopic sight of a gun, the telescopic sight comprising an eyepiece end, an objective end and a first reticle seen from the eyepiece end, an eyepiece installed on the eyepiece end, and an objective lens installed on the objective end, the auxiliary optical system comprising:

• a digital imaging member, a display member, a first fixing member and a second fixing member, the digital imaging member fixed at the objective end by the first fixing member and partially shielding the objective lens, so that the digital imaging member and the objective end are partially overlapped in a line of sight direction of the telescopic sight;
• the display member fixed at the eyepiece end by the second fixing member and electrically connected to the digital imaging member, the display member comprising a display screen;
• the digital imaging member configured to perform photosensitive imaging on an environmental image and convert the environmental image into a video signal, generate a second reticle that is adjustable and has the same function as the first reticle, and stack the second reticle with the video signal and then transmit to the display member for display;
• the digital imaging member comprising an on screen display module, the on screen display module comprising a setting program for setting and configured to calculate input data according to the video signal and characteristics of the display screen of the display member, generate the second reticle that is adjustable, and stack the second reticle on the video signal to be transmitted to the display member;
• and wherein
• the on screen display module determines a parallel aimpoint on the display screen through center distances between the objective end of the telescopic sight and a lens of the digital imaging member in a horizontal direction and in a vertical direction, the parallel aimpoint is a pixel point of the display screen of the display member corresponding to a sighting line of the lens of the digital imaging member, and the sighting line of the lens of the digital imaging member corresponding to the pixel point is parallel to a sighting line of a crosshair center of the first reticle of the telescopic sight.