Red Dot Sight

• Posted by foreseen optics Jan 16 Filed in Technology 16 views
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  Red Dot Sight

  Red dot sights are characterized by their compact size, lightweight, and low magnification.

  They work by projecting light from an LED source onto a coated beamsplitter, creating an image that is reflected into the shooter's eye. Due to their simple operating principle, red dot sights are generally made to be compact and lightweight. Because of the imaging principle, red dot sights do not have magnification. Additionally, since an image needs to be formed on the glass, the glass must be coated, otherwise the light will pass directly through the glass without forming an image. The coatings on red dot sight lenses are generally divided into red coatings and silver coatings. Red coatings allow the lens to have a higher light transmittance, but can cause the field of view to appear green. Silver coatings can preserve the original color of the field of view to a greater extent but have a lower light transmittance compared to red coatings. Thanks to excellent coating technology, the green tint issue with red coatings and the low light transmittance issue with silver coatings can both be mitigated to varying degrees.

  Red dot sights can be further subdivided into window-style red dots (open red dots) and tube-style red dots (closed red dots). The former has a larger field of view, while the latter has better durability.