kalansilmäobjektiivi
Kalansilmäobjektiivi, known in English as a fisheye lens, is an ultra-wide-angle lens that produces a strong, visual distortion intended to create a wide, panoramic or hemispherical image. The name derives from the term "fish-eye," a view from the perspective of a fish in a bowl, suggesting a distorted, wide field of vision. These lenses achieve their extreme field of view through significant optical distortion, which results in straight lines appearing to curve, especially near the edges of the image. This distortion is a defining characteristic rather than a flaw and is often intentionally employed for artistic or specific photographic purposes.
Fisheye lenses can be categorized into two main types: circular and full-frame. Circular fisheye lenses produce