kalansilmäobjektiivin

A kalansilmäobjektiivi, or fisheye lens, is an ultra-wide-angle lens that produces a strong, deliberate, spherical distortion creating a wide panoramic or hemispherical image. The term "fisheye" comes from the perceived view of a fish looking out from underwater. These lenses are designed to achieve an extremely wide field of view, often up to 180 degrees or even more. This wide perspective is achieved by intentionally distorting straight lines, causing them to appear curved, particularly near the edges of the frame.

Fisheye lenses are classified into two main types: circular fisheye and full-frame fisheye. A circular fisheye produces a fully circular image within the rectangular frame, surrounded by black. A full-frame fisheye, while still extremely wide, fills the entire rectangular frame with an image that has significant distortion. The distortion is most pronounced in the straight lines that are not passing through the center of the lens.

Despite their inherent distortion, fisheye lenses are valued for their unique aesthetic and the expansive perspective they offer. They are commonly used in astrophotography to capture large portions of the night sky, in action sports photography to convey a sense of immersion and dynamism, and in architectural photography to showcase the grandeur of spaces. They can also be employed creatively for artistic effect, transforming ordinary scenes into surreal vistas.