The fisheye lens is a special lens in an ultra-wide-angle lens, and its viewing angle strives to reach or exceed the range that human eyes can see. In spite of this, there is still a big difference, because the scenes we see in real life are regular fixed forms, and the effect produced by the fish-eye lens exceeds this category.

As we all know, the shorter the focal length, the larger the viewing angle and the larger the viewing angle, the stronger the deformation due to the optical principle. In order to achieve a very large viewing angle of 180 degrees, the fisheye lens designer had to make sacrifices that allow this deformation (barrel distortion) to be reasonable. The result is that, except for the scene in the center of the picture, the other scenes that should have been horizontal or vertical have undergone corresponding changes. It is also this intense visual effect that provides opportunities for photographers who are imaginative and courageous to demonstrate their personal creativity.

Fisheye lens application:

1. Interesting prospects can produce powerful visual impact;

2. Depth of field can range from a few centimeters to infinity;

3. Select as few lines and faces as possible as the subject; compose the subject as much as possible into the center of the picture when composing the picture; this will minimize distortion;

4. Instead, choose as many horizontal lines and easily recognizable scenes as possible on the edges of the picture to maximize distortion.

5. Look at the edge of the viewfinder to see if there are photographers' hands, feet, camera belts, or photographers being shot into the lens so as not to affect the artistic effect of the screen.

6. For most fisheye lenses, commonly used filters cannot be used.

The choice of a fisheye lens For photographers who want to use a fisheye lens, the first and most critical step is to decide which fisheye lens you want to achieve. Here are three specifications to choose from: Fisheye Lens, fisheye lens and a homemade device.

Only 35mm SLR cameras have a true fisheye lens. The focal length is about 8mm. The image is completely circular with a viewing angle of 180 degrees; a few models can reach up to 220 degrees, and are mainly used for technological photography.

Since the fisheye lens is composed of many optical lenses and requires precision molding and assembly, it is very expensive. In contrast, buying a fisheye lens is much cheaper. This additional mirror does not have a focal length, but it can change the focal length of the original lens, such as 0.4 times the attached mirror mounted on a 50mm standard lens, the focal length becomes: 50 × 0.42mm, if mounted on a 28mm wide-angle lens, focal length Change can be imagined. Only special effects produced by a fisheye lens will appear in your viewfinder. Finally, you may wish to try a homemade fish-eye device: Take a round hole in the spare lens cap, fix a home "cat's-eye" lens, and then cover the lens with a head, you can produce a fish-eye The effect of the lens, this method does not cost much and allows you to enjoy a little fun.

The 15mm and 16mm fisheye lenses are more common and are suitable for 35mm SLR cameras. The 24mm, 30mm, and 35mm fisheye lenses are suitable for Mamiya 645 (6x4.5cm), Hasselblad (6x6cm), and Pantex 67 (6x7cm) medium format SLR cameras, respectively.