A "3 x 9 x 40" scope refers to a type of optical sight used on firearms, such as rifles. The numbers indicate the magnification and objective lens diameter of the scope. Here’s a breakdown of what each part means:
Magnification (3 x 9):
- The first number (3) indicates the lowest magnification level, which is 3 times (or 3x) the size of the target as seen with the naked eye.
- The second number (9) indicates the highest magnification level, which is 9 times (or 9x) the size of the target.
- This means the scope allows for variable magnification; you can adjust it anywhere between 3x and 9x, giving you flexibility depending on your shooting conditions and distances.
- Objective Lens Diameter (40):
- The last number (40) refers to the diameter of the objective lens (the lens at the front of the scope) in millimeters. In this case, it is 40 mm.
- A larger objective lens typically allows more light to enter the scope, which can result in a brighter image, especially in low-light conditions. It can also provide a wider field of view.
Summary:
- A 3 x 9 x 40 scope allows for variable magnification from 3x to 9x, making it useful for various shooting situations ranging from close to medium distance. The 40 mm objective lens diameter enhances light transmission, contributing to a clearer and brighter image, particularly in challenging lighting conditions.
These scopes are commonly used for hunting, target shooting, and other shooting sports because of their versatility and effectiveness at different distances.