What is the fisheye lens?

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Fisheye lens focal length is a very short and close to or equal to 180 ° angle lens. The focal length of camera lens was below 18mm can be called fisheye lens. Fisheye lens is a special effect lens. It was originally designed for astrophotography, low price is often of poor quality, high quality is very expensive. Fisheye lens is not used lens, when the basic lens has been equipped, can also try to use it for some special effects creation.

Fisheye lens has two basic types.

1. A fisheye lens can produce less than a circular frame image on the screen, such as when the fisheye lens up to eye height and shot in front, will shoot down everything in front of you hemispherical space, even your own shoes, and this image is usually in the form of a circular frame, and not fill the entire rectangular frame.

2. Another fisheye lens can produce rectangular frame images with the barrel distortion, the distortion is great, X-ray lines radiated outward from the core slide in all directions; in addition to the center line of the screen remains flat, straight and other parts will produce bending deformation.