What is a fish-eye lens?

Photography fisheye fisheye lens lets you capture wide-angle images with a very large field of vision. To do this, use a hemispherical shape, such as fish eyes, to capture a wide range of radius. In the images taken with fish-eye camera lens, looks normal, but outside the central elements of image distortion.
The difference between the fisheye lens and wide angle lensImportant to understand the difference between the fisheye and ultra wide-angle lens or ordinary.
The main difference is corrected wide-angle lens distortion correction elements, rather than a fish-eye camera lens. Pictures taken with a fisheye lens has an extreme point of 180 degree views and photographs marked "barrel distortion." Angle wide-angle lens, fisheye lens focal length less than the same.
Fish-eye lens typeMake sure you choose the right type of fish-eye lens for your needs. There are two types of fisheye lens: the diagonal and circular.
A diagonal fisheye lens is often preferred, because they map a 180-degree view of the "diagonal" in your frame sensor, the image area is full of pixels. This is why the diagonal are often called "full-frame fish-eye lens."
A circular fisheye lens focal length is shorter than the diagonal to do, and create a circle in the center of the image on the screen of the camera. For the full-frame camera, you need a focal length range is 8 - 10 mm. If you are using a digital camera with APS - C sized sensor, the fish-eye lens, focal length range of 4 or 5 mm is required.
Tips and techniques, use of fish-eye lens1. Buy the right lens, the correct sensor size. Most digital camera owners with APS - C sized sensor and crop factor of 1.5 times, 1.6 times as long. For example, if you buy a Canon 15 mm Canon 7D full frame diagonal to you, because you have to make some cool fish-eye image, you will be very disappointed, Canon fisheye. You end up with even a wide-angle lens, the effective focal length of 24mm. (15 mm x 24 mm = 1.6). In order to achieve the "fish-eye effect", you will need a lens with a focal length of 8 or 10mm.
General rule of thumb is that if you shoot full frame camera, such as the Canon 5D Mark II or Nikon D700, you need a lens focal length 15 or 16mm. If you are using a camera with APS - C sized sensor, you need 8 after the property range from 11 mm.
2. Choose a scene that will enhance the ultimate fish-eye lens effect the image, such as construction drawings. You can get a real WOW, when produced to capture the interest of large buildings or areas. The use of isolation one in the crowd - it can look spectacular when shooting from above.
3. Is super creative. Large field of view means you can get a perspective that is very unusual for small spaces or inaccessible. Or use the fisheye lens to create a humorous effect, such as extreme close-up farm animals.
4. Think about the composition of your shot. Carefully consider the prospects you want to stand out and can be used to frame the background. One example is the focus of lavender flowers in the foreground of hills or mountains frame the background.
5. Note that each line of the scene, and to ensure straight lines concentrated in the frame. Remember, fish-eye lens distorts any center, so the only straight line are those in the middle of the picture. Away from the center of the tourist routes, the greater the distortion will be.
6. Reduced, improving circulation distorted image. In full extension, creating a circular fisheye images, graphics elements and pressing elements around the outer loop.
7. Reduce the focal length to use wide-angle fisheye lens. Shorter focal length, will reduce the distortion of the final image. When you zoom all the way, you can double-click fisheye wide-angle lens, barrel distortion, but be prepared to accept some of the edge of the image.
Fish-eye lens, is not only versatile, you can have a lot of fun with it. So I went out to play!