Optical sight night vision sight bai collimator with optical sight telephoto du type sight (zhiTelescopic sight), collimating sight (daoCollimating optical sight), reflective sight (Reflex sight) low light sight, infrared sight (It can be subdivided into two types: active infrared and thermal imaging) The principle of Reflex is briefly described as: the concave surface of the spectroscope is coated with one or more tomographic films, and the light emitted by the illumination system passes through The reticle then forms a dot (or aiming mark such as a ring) on the spectroscope and reflects parallel light into the human eye. At the same time, the human eye sees the target through the spectroscope. When the aiming mark overlaps the target, that is Finish aiming.
The main function of an optical sight is to use an optical lens to form images, overlapping the target image and the aiming line on the same focus plane, even if the eye is slightly offset, it will not affect the aiming point. Usually the optical sight can magnify the image, and there are some that do not. The scopes that can be magnified can be divided into two types: fixed or adjustable. For example, 4x28 refers to the objective lens diameter of 28 mm, and the fixed magnification scope is 4 times. 3-9x40 refers to the objective lens 40 mm. Adjust the magnification of the scope from 3x to 9x.
An optical sight has at least three optical lens groups, one is the objective lens group (Objective Lens), the other is the corrector tube group (Erector Tube), and the eyepiece group (Onicular Lens), and there may be other lens groups. The objective lens group is responsible for collecting light, so when the objective lens is larger, the sight in the scope should be brighter. The eyepiece group is responsible for changing these rays back to parallel rays so that the eyes can focus and create the largest field of view; while the correction lens group is Correct the image of the objective lens from upside-down and left-right to the correct direction, and adjust the magnification. The line of sight can be located on the first focus plane before the correction lens group or the second focus plane after it. The wind deflection adjustment button, height adjustment button, and magnification ring are all used to control the correction lens group Left and right, high and low, front and rear positions.
There may be as many as 9 lenses in the body of an advanced sight. With proper coating, the light transmittance may exceed 95%. However, even if the light transmittance is not so high, the brightness in the field of view may still be higher than that of the naked eye, because the light collection area of the general objective lens is larger than that of the eye.
