What are the characteristics of fisheye lens, wide-angle lens, medium-focus lens and telephoto lens?

The fisheye lens is very distorted, so you can take some interesting photos with it. The fisheye lens is a lens with a very short focal length and a viewing angle close to or equal to180. A lens with a focal length of 16mm or less can usually be regarded as a fisheye lens. It is an extreme wide-angle lens, and "fisheye lens" is its common name. In order to make the lens reach the maximum photographic angle, the front lens of this kind of photographic lens protrudes to the front of the lens in a parabolic shape, which is quite similar to the fish's eyes, hence the name "fisheye lens". Fisheye lens belongs to a special super wide-angle lens, and its viewing angle strives to reach or exceed the range that human eyes can see. Nevertheless, there is still a big difference, because the scenery we see in real life is regular and fixed, and the picture effect produced by fisheye lens is beyond this category.

Wide angle;

Before introducing the wide-angle camera, let's know the focal length of the camera. In fact, when people talk about the focal length of a digital camera, they are not talking about the actual focal length of the digital camera, but about the equivalent focal length, that is, the focal length relative to the traditional 135 camera. From the principle of photography, the smaller the focal length, the wider the field of vision, and the wider the range of scenery that the photo can accommodate; The larger the focal length, the narrower the field of view, which means that you can shoot distant objects.

In traditional cameras, wide-angle lenses over 28mm are very popular. However, due to the particularity of small photosensitive devices in ordinary digital cameras, the physical focal length of the lens needs to be very short to achieve a wide angle, which leads to high requirements for aberration correction and anti-glare coating. With people paying more and more attention to wide-angle shooting, now around 3000 yuan, cheap wide-angle digital cameras are becoming more and more popular. Ricoh is the originator of a portable wide-angle digital camera with high cost performance. From G3/G4 wide angle to RX/GX series products, 28mm wide angle is its biggest selling point. In addition, Canon, Olympus, Konica Minolta and other cameras have also introduced 28mm wide-angle cameras.

For most popular digital cameras on the market, the wide-angle focal length is generally between 35 and 38mm. The real wide-angle digital camera is actually a product with a lens focal length covering a wide angle of 28mm. Because the wide-angle field of view of 28 mm is wider than that of 35mm and 38 mm commonly used in digital cameras, the wide-angle field of view of 28 mm is 76 degrees, while that of 35mm is only 62 degrees, so it can produce very unique visual effects and accommodate a wider scene. This is also the reason why consumers are more optimistic about 28mm wide-angle digital cameras. The biggest feature of wide angle is that it can shoot a wide range, with exaggerated sense of distance and wide focus range. When using wide angle, you can enlarge the object in front of you and narrow the object in the distance, and the surrounding images are easily distorted. Wide-angle can also adjust any point in the image to the most appropriate focal length to make the picture clearer, which can also be called complete autofocus.

Wide-angle digital camera has short focal length, wide viewing angle and deep scenery, which is suitable for taking photos of large scenes, such as architecture and scenery. A long focal length lens refers to a photographic lens whose focal length is longer than that of a standard lens. Telefocal lenses are divided into ordinary telephoto lenses and ultra-telephoto lenses. The focal length of ordinary telephoto lens is close to that of standard lens, while the focal length of ultra telephoto lens is much larger than that of standard lens. Take 135 camera as an example, the photographic lens with a focal length of 85 mm-300 mm is a normal telephoto lens, and the lens with a focal length of more than 300 mm is a super telephoto lens.