Macro and telephoto

Telefocus means that the lens can be extended to a relatively long distance, such as 10 times, that is, the lens of 35 mm is extended to 350 mm, which is convenient for capturing distant scenes;

Macro is actually an extension of ordinary photography, and its working mechanism, like ordinary photography, must abide by the basic laws of optics.

Macro photography involves a concept of magnification, which is related to the reproduction ratio of images. The copy ratio is the numerical relationship between the actual size of the subject and the size of the image, which is usually expressed by the numbers on both sides of the colon:

[Image Size]: [Actual size of object]

Generally, any number on the left or right is classified as 1, which is generally expressed as: 1: X/X: 1. The former means that [the actual size of the subject] is x times the size of the image; The latter means that [image size] is x times the actual size of the object.

For example, it is labeled as:

1: 10: indicates that the actual size of the subject is 10 times the size of the image, or the size of the image is110;

1: 1: indicates that the actual size of the subject is equal to the image size.

According to the magnification, macro photography can be subdivided into close-range photography and ultra-close-range photography. There is no strict definition, but the general definition is:

Close-range photography: the magnification is1:10 ~1:1;

Ultra-close photography:1:1~ 6:1;

Beyond this magnification, it begins to enter the scope of photomicrography.