Thursday, 17 January 2008

When world looks round

My new quest after thinking about buying fish eye lens!

(Source : Wikipedia)
In photography, a fisheye lens is a wide-angle lens that takes in an extremely wide, hemispherical image. Originally developed for use in meteorology and astronomy and called "whole-sky lenses", fisheye lenses quickly became popular in general photography for their unique, distorted appearance. They are often used by photographers shooting broad landscapes to suggest the curve of the Earth. Hemispherical photography is used for various scientific purposes to study plant canopy geometry and to calculate near-ground solar radiation.
The focal lengths of fisheye lenses depend on the film format. For the popular 35 mm film format, typical focal lengths of fisheye lenses are between 8 mm and 10 mm for circular lenses, and 15-16 mm for full-frame lenses.
All the ultra-wide angle lenses suffer from some amount of distortion. While this can easily be corrected for moderately wide angles of view, rectilinear ultra-wide angle lenses with angles of view greater than 90 degrees are difficult to design. Fisheye lenses achieve extremely wide angles of view by foregoing a rectilinear image, opting instead for a special mapping (for example: equisolid angle), which gives images a characteristic convex appearance. A panorama by rotating lens or stitching images (cylindrical perspective) is not a fisheye photo.

Circular
The picture using a circular fish eye lens
The first types of fisheye lenses to be developed were "circular fisheyes" - lenses which took in a 180-degree hemisphere and projected this as a circle within the film frame. Some circular fisheyes were available in orthographic projection models for scientific applications.

Full-frame
As fisheye lenses gained popularity in general photography, camera companies began manufacturing fisheye lenses that enlarged the image circle to cover the entire 35 mm film frame. Because of this, the picture angle produced by these lenses only measures 180 degrees when measured from corner to corner. The first full-frame fisheye lens to be mass-produced was a 16 mm lens made by Nikon in the late 1960s. This is the type of fisheye most commonly used by photographers. Digital cameras with APS-sized sensors require a 10.5 mm lens to get the same effect as a 16 mm lens on a camera with an image sensor the size of a 35mm film image. [1]



Picture taken by Hendra Samudera of OneClick Photography.

I think I am going to look for it in ebay now.

No comments: