This allows them to have features such as estimating range and bullet drop (such as that seen in the Modern Rangefinding and the SVD type above). The etched lines allow for more complex crosshair shapes, including circles, lines that don't need to touch or have gaps in between. The thin plate of glass is then mounted inside the scope. The nice thing about wire reticles is that they don't block out much light and are very durable.Īnother technique to make the crosshair lines is to etch the lines onto a thin plate of glass, using a diamond cutter. By flattening the wire in different places, the manufacturer can make Duplex Crosshairs or Target Dot type crosshairs. The wires are mounted on the inside of the telescope tube.
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Later on, they were made of thin wires (and many scopes still use wire crosshairs to this day, especially cheaper ones). The thick lines allow the user to quickly figure out where the center of the reticle is and the thinner lines allow for precision aiming.īack in the day, the crosshairs of reticles were made of natural fibers, such as hair or spiderweb. Examples of this would be the Duplex Crosshair, the Mil-Dot and the Modern Rangefinding reticle above. Therefore, modern telescopic sights use a mixture of both (i.e.) thicker lines on the outside and thinner lines closer to the middle.
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Thicker lines are more visible, but they block out more of the image and lose some precision.
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However, it is easier for the user to lose sight of the lines, especially in complex backgrounds. Fine crosshairs allow the user to see more of the target and do not block out much light. Thanks to movies, most people are familiar with the Fine Crosshair type of reticle above.