Aperture Ratio is the ratio (D:f) between the diameter (D) of the incident lens of the lens and the focal length (f). It displays the brightness of the lens. Search box. 

While general hemispherical dome has an angle of view covering phenomenon due to structural problems, aspherical hemispherical dome minimizes the angle of view covering phenomenon by raising the central axis upward. 

Business Intelligence is the study of how companies can make efficient decisions by collecting, organizing, analyzing, and utilizing data. 

Vignetting, also known as “light fall-off” (sometimes spelled “light falloff”) is common in optics and photography, which in simple terms means darkening of image corners when compared to the center. Vignetting is either caused by optics, or is purposefully added in post-processing in order to draw the viewer’s eye away from the distractions in the corner, towards the center of the image.