A fisheye lens is a type of lens with a very short focal length and a field of view close to or equal to 180°. It is an extreme wide-angle lens, and 'fisheye lens' is its colloquial name."
There are two types of imaging with fisheye lenses: one fills the frame like other lenses, and the other produces a circular image. Regardless of the type, images captured with fisheye lenses exhibit significant distortion and strong perspective convergence, making them commonly used for special effects.
Due to their ability to achieve full spatial and temporal real-time information acquisition, fisheye lenses meet the demands of modern warfare for information acquisition technology, which other optical detection methods cannot match. Therefore, fisheye lenses have important applications in defense and military fields.
Fisheye lenses are also suitable for dome projection and irregular screen projection, such as full-dome, half-dome, and dome cap projections in large museums and exhibition halls.
Currently, dome projection projects mainly adopt the following schemes: single projection (a single projector placed near the center of the dome), dual projection (two projectors located at the poles of the dome), and multi-projection stitching (usually four, five, or more projectors).
• High-definition resolution ensures clear imaging.
• Large field of view, up to 180 degrees.
• Minimal image distortion, with some fisheye lenses featuring Tailore Distortion correction.
• Good uniformity of image illumination.
• Long back focal distance, compatible with various projectors.
• Large relative aperture, with a small F#.
