The Principle, Function, and Usage Techniques of Fisheye Lenses
A fisheye lens is a specialized type of wide-angle lens designed with a pronounced spherical curvature—resembling the spherical crystalline lens of a fish's eye—and an image plane positioned closer to the lens elements, mimicking the short distance between a fish's lens and its retina. Fisheye lenses have a field of view that can approach or exceed 180 degrees. Due to the extremely large field of view, the distortion is also very large. Generally, straight lines around the edges of the image will be bent, while only straight lines in the center of the lens can maintain their original state. The principle and function of a fisheye lens Fisheye lenses achieve their distinctive effect by utilizing very short focal lengths and highly curved lens elements. It typically consists of multiple lenses, each with a large curvature, allowing light to enter from various angles and be projected onto the photographic film or image sensor. Because they capture a field of view that exceeds tha...