3-18x50 SFIR Rifle Scopes for Shooting

The "3-18x50 SFIR" refers to a specific type of shooting rifle scope. Let's break down what each component of the name represents:

Magnification Range: "3-18x" indicates the magnification range of the scope. In this case, it means that the scope can provide variable magnification from 3 times (3x) to 18 times (18x). This allows the shooter to zoom in and out to suit their shooting needs, providing a wider field of view at lower magnifications and more precise targeting at higher magnifications.

Objective Lens Diameter: The number "50" represents the diameter of the objective lens in millimeters. The objective lens is the one located at the front of the scope and gathers light to transmit to the shooter's eye. A larger objective lens diameter generally allows more light to enter the scope, resulting in a brighter image.

SFIR: "SFIR" stands for Side Focus/Parallax Adjustment. This feature allows the shooter to adjust the parallax error, which can occur when the target image is not focused correctly or appears to move slightly in relation to the reticle when the shooter's eye position changes. By using the side focus adjustment, the shooter can fine-tune the focus and minimize parallax error for improved accuracy.

Overall, the 3-18x50 SFIR shooting rifle scope is designed to provide variable magnification, a relatively large objective lens diameter for better light transmission, and a side focus/parallax adjustment feature for enhanced accuracy. It can be suitable for various shooting applications, including target shooting, hunting, and long-range shooting.