What's the difference between macro lens and ordinary lens?

1. The main difference between a normal lens and a macro lens is the magnification. The magnification of macro lens is 1: 1, and that of ordinary lens is about 1:3~6.8.

2. The macro lens can enlarge the object in proportion, and the imaging quality is high. However, the image quality of the object magnified by ordinary lens is low, and the image is not as clear as that of macro lens.

3. Macro lens can reach the focal length ratio of 1: 4, while ordinary lens can only reach 1: 1.

4. The macro lens can be used as an ordinary lens and can focus at infinity. Some professional macro lenses can't focus at infinity, but they will definitely have a larger magnification.

5. Macro lens and ordinary lens have different pixels in the surrounding environment of the shot image besides the pixels of the shot object. In a word, macro lens is more suitable for shooting tiny objects than ordinary lens. Because macro lens pays more attention to close-range focusing imaging in design, ordinary lens lacks relevant design.

Extended data:

How to use macro lens

1. Select the corresponding macro lens as required.

Macro lenses with different focal lengths have different application characteristics, specifically: under the same image-field ratio, the shorter the focal length of the lens, the closer the shooting distance; At the same distance, the longer the focal length, the larger the picture; Short focal length lens can emphasize the perspective of the picture, and long focal length lens can compress the picture better, blur the background and highlight the subject. Generally speaking, in order to leave a large space between the lens and the main body for lighting and light distribution, it is recommended to use a macro lens with a long focal length. When shooting insects or other small animals, you should also use a long-focus macro lens to shoot at a certain distance from insects or small animals, so as not to scare them and miss the shooting opportunity.

2. Appropriate compensation for risks

When using macro lens to shoot close-ups, appropriate exposure compensation should be made according to the shooting magnification. Generally, the corresponding exposure compensation data will be recommended in the instruction manual of macro lens. At present, most single-lens reflex cameras have automatic exposure function. There is no need for exposure compensation when shooting with the automatic exposure file of a camera with TTL function.

3. Pay attention to the shooting quality under macro function.

Many zoom lenses also have macro shooting function (strictly speaking, it should be called "macro function" or high-power shooting function, because many zoom lenses marked with macro are not very close when shooting at high power), but there is still a gap compared with the macro function of fixed-focus lenses. First, the shooting magnification is small, generally only 1: 4 or even smaller (for example, the maximum macro shooting magnification of a Nikon lens is only 1: 5.9 at 200mm focal length and 1: 14 at 80mm focal length), and only a few of them reach1:. Secondly, the quality of macro files of zoom lens is not as good as that of fixed focus macro lens. However, Minolta AF macro zoom 3x-LX F/ 1.7-2.8 is a special case of zoom lens in macro function. This is a macro zoom lens, the macro function is greater than the fixed focus lens, the shooting magnification is 1 to 3 times (enlarged shooting), and it can still focus automatically when shooting at high magnification, which is the first in the world.

Step 4 focus accurately

Macro lens provides convenience for shooting small objects at close range, but when using macro lens for macro shooting, the depth of field is very small, so focus should be very careful, and the camera should be mounted on a tripod or a remake stand as much as possible.

References:

Baidu Encyclopedia: Macro Lens