Nowadays, many people have started using riflescopes and learning how to adjust the diopter. Riflescopes use the principle of optical imaging to aim at objects.

3-9, 6-24, and 10-40: magnification levels compared with the naked eye. The magnification allows distant targets to be seen and identified clearly, making it suitable for long-range precision shooting.

Many people are not quite sure how to adjust, zero, and use a newly purchased scope. Experienced users may find it easier, but for beginners,

Optical telescopic sights are divided into two types: daylight scopes and night-vision sights. Daylight scopes are generally divided into three categories:　　The first category is the Keplerian telescopic sight.

A scope is a precision instrument. Most users will carefully examine it from all directions when they first receive it, and will turn almost every button.