takatähtäämisvälineestä

A takatähtäämisväline, often translated as a rear-sight or aperture sight, is a sighting device used on firearms. Its primary function is to provide a reference point for the shooter to align with the front sight and the target, facilitating accurate aiming. Typically, a takatähtäämisväline consists of a small hole or aperture through which the shooter looks. The eye naturally centers itself within this aperture. The shooter then aligns the front sight, which is usually a post or bead, with the target by looking through the rear sight's opening.

These sights are commonly found on rifles, pistols, and some shotguns. Their design can vary significantly. Some are simple, fixed apertures, while others are adjustable for windage (horizontal adjustment) and elevation (vertical adjustment), allowing the shooter to compensate for projectile drop and drift. Adjustable rear sights are particularly useful for long-range shooting or when using different ammunition types. The precision offered by a well-designed takatähtäämisväline contributes significantly to the accuracy of a firearm, making it a crucial component for many shooting disciplines, including hunting, target shooting, and military applications. They are generally considered more accurate than open sights, which consist of a notch and a post, due to the aperture's ability to guide the eye.