What does the camera fisheye wide-angle macro mean?

Take a 35mm single lens reflex camera as an example. A wide-angle lens usually refers to a lens with a focal length of 17 to 35mm.

The basic characteristics of a wide-angle lens are its large viewing angle and wide field of vision. The range of scenery observed from a certain viewpoint is much larger than that seen by human eyes at the same viewpoint; The depth of field is long, which can show a fairly clear range; It can emphasize the perspective effect of the picture, be good at exaggerating the foreground and express the sense of distance of the scene, which is conducive to enhancing the appeal of the picture.

Basic characteristics of wide-angle lens:

1. Wide visual angle, covering a wide range of scenery. The so-called wide viewing angle range means that at the same viewing point (the distance from the subject is constant), the scene is viewed with wide-angle, standard and telephoto lenses with three different focal lengths. As a result, the former shoots more up, down, left and right scenes than the latter. When the photographer has no retreat, it is difficult to take a complete picture (such as taking a group photo) with a standard lens of 50 mm ), using a wide-angle lens can easily solve the problem. Furthermore, for example, shooting a vast Yuan Ye or a tall building in a city, perhaps only a part of the scenery can be photographed with a standard lens, which cannot show the breadth or height of the scenery. Shooting with a wide-angle lens can effectively show the open momentum of large scenes or majestic buildings.

2. Short focal length and long depth of field. Photographers usually rely on the short focal length and long depth of field of wide-angle lenses to bring the whole scene from near to far into a clear range of expression when shooting a wide scene. In addition, when shooting with a wide-angle lens, if a smaller aperture is used at the same time, the depth of field of the scene will become longer. For example, if a photographer shoots with a 28 mm wide-angle lens, the focus is on a subject about 3 meters, and the aperture is adjusted to F8, then from 1 meter to infinity, it almost enters the depth of field. It is precisely because of this long depth of field that wide-angle lenses are often used by photographers as fast-moving lenses with strong maneuverability. On some occasions, the photographer can quickly capture the picture by manipulating the wide-angle lens without focusing on the subject.

3. You can emphasize the prospect and highlight the contrast between far and near. This is another important performance of wide-angle lens. The so-called emphasis on foreground and far-near contrast means that wide-angle lens can emphasize far-near contrast more than other lenses. In other words, the photos taken with wide-angle lens are closer and farther, which makes people feel that the distance has been widened and has a strong perspective effect in the depth direction. Especially when shooting with a super wide-angle lens with short focal length, the effect of being near big and far small is particularly remarkable.

4. It can be exaggerated and deformed. Generally speaking, it is taboo to use a wide-angle lens when the subject is exaggerated and deformed. In fact, it is not necessarily undesirable for the subject to exaggerate and deform appropriately. Experienced photographers often use wide-angle lenses to deform the subject moderately and take some unusual photos of very inconspicuous scenes that people ignore. Of course, using a wide-angle lens to express exaggeration and distortion should be based on the needs of the subject matter, and the second should be few and precise. No matter whether the theme is necessary or not, it is not worthwhile to abuse the exaggerated deformation of wide-angle lens and blindly pursue the bizarre effect in form.

fish-eye lens

Take the interchangeable lens suitable for 35mm SLR camera as an example. Fish-eye lens is a kind of ultra-wide-angle photographic lens with short focal length, and its focal length is about 6- 16mm. "Fish-eye 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".

The size of fisheye lens is very large. Take the fisheye lens for a 35mm single lens reflex camera as an example. The fisheye lens is installed on the body of a smaller 35mm single-lens reflex camera, which has a feeling of "big head (lens) and small body (body)", and the weight of the fisheye lens is not light (for example, the manual focusing fisheye lens of Nicol 6mm /F2.8 weighs 5,200g). As mentioned above, the front lens of the fisheye lens has a large diameter and is thrown in front of the lens, so this lens cannot be equipped with a filter like a normal lens. Fisheye lenses usually use a built-in filter. According to the shooting needs, the photographer manipulates the filter conversion ring on the lens to convert the required filter into the shooting light path of the lens. The front lens of fisheye lens is a very important lens in the whole lens. Because it is thrown in front of the camera, the photographer should pay special attention not to collide with the camera when shooting (especially when shooting close to the subject). In addition, when some old fisheye lenses are connected to a 35mm single-lens reflex camera, the back of the lens is deeply inserted into the camera body, and the mirror of the camera must be turned up and locked, and the pentaprism viewfinder of the camera will not be used, so it is necessary to set an additional viewfinder on the camera to take pictures.

Low power photographic lens

Macro photographic lens refers to a special photographic lens that can be used for macro or close-up photography without installing close-up accessories such as close-up mirror, close-up collar and close-up track leather cavity.

Macro camera lens is a kind of camera lens for shooting tiny objects or retaking small pictures. This kind of lens has quite high resolution, minimum distortion and aberration, high contrast and good color reproducibility. Macro camera lens has good close-range resolution, which can keep the image quality unchanged in the whole focusing range. General photographic lenses are mainly used to shoot scenes within the usual focal length, and cannot be directly used for close-ups. To shoot close-ups with general photographic lens, close-up accessories such as close-up lens, close-up collar or close-up leather cavity must be added to the lens before it can be taken. However, after adding close-up accessories such as close-up lens, close-up collar or close-up leather cavity to the general photographic lens, it is in the "close-up" state and cannot be quickly restored to the normal photographic state from the "close-up" state. In other words, it is difficult to take close-ups alternately by using general photographic lenses and close-up accessories. Macro photography lens is different. Its close-up does not depend on other close-up accessories, and all close-up operations are carried out on the lens itself. It can connect the focal length from close-up to infinity, so that it can be quickly adjusted from close-up to ordinary photography, which provides convenience for photographers to alternately take close-up photography and ordinary photography.

Macro photographic lenses generally have two structures. One macro photography lens adopts the structure of built-in telescopic lens barrel, and the other adopts the structure of exchanging the front and rear positions of optical lens groups in the lens. The former, in ordinary photography, the photographer can focus normally only by turning the focus ring of the lens. If he wants to take a close shot, as long as the focus ring that has been rotated to the nearest focus position continues to rotate, he can move the entire optical system of the lens forward synchronously with the built-in lens barrel, thereby increasing the image distance and achieving the purpose of close shot. The latter obtains higher image magnification by changing the front and rear positions of the optical lens group in the lens, thus achieving the purpose of close-up.

Common macro photography lenses include Nicole Micro 55mm/F2.8 manual focusing macro photography lens, etc.