Optical sights are a large category of sights. If we want to use the sights on the hunting ground and get a full load, we must first figure out what the composition and method of optical sights are.
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 tube group is Correct the image of the objective lens from upside down and left and right to the correct direction, and adjust the magnification.
The line of sight can be located at the first focus plane before the correction lens group, or the second focus plane after it, and the wind deflection adjustment knob, height adjustment knob, and magnification ring are all used to control the correction lens group In the 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. Through 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 the light collection area of the eye.
