What is the use of the "flower" pattern displayed in the camera?

The following quotation

Close range is also called macro shooting. Usually, the buttons with flowers on consumer digital cameras (as shown below) are the conversion buttons for macro shooting.

Macro photography is one of the specialties of digital cameras. With macro photography, ordinary scenes can also be made into dramatic scenes. Macro photography is especially good at expressing tiny things such as flowers, birds, fish and insects, and can fully show details. It can also express its creativity at will in topic selection, composition and lighting, unlike taking pictures of scenery, people and folk culture, which are subject to many conditions. Macros are quick to get started, although they are mostly sketches, but they often contain the good intentions of many authors, and they can also be called fine works.

The purpose of macro photography is to show the details of the subject and the subtle parts completely. In macro photography, there is a term that must be recognized, and it is Magnificatlon. Because macro photography is actually like magnification photography, the magnification directly affects the effect of macro photography. Because the magnification is defined by the ratio of the image obtained from the film surface to the size of the object, the magnification is expressed as the ratio. For this reason, magnification is also called "image ratio".

It is often heard that the lens can take macro effects of 1: 1 and 1: 2, and these ratios refer to the magnification of the lens. The value on the left represents the size of the image on the film plane, while the value on the right represents the size of the actual object. When the lens can reach the magnification of 1: 1, the lens can completely project the real size of the object onto the film plane. Let's give a simple example: the area of 135 film is 24 mm x 36 mm. If we use a lens that can completely record the subject with the same area of 24 mm x 36 mm on 135 film, the magnification of this lens is 1: 1. We should remember that the larger the number on the left, the higher the magnification. If the value on the right is greater than the value on the left, the magnification will be smaller.

At present, the macro function of consumer digital cameras is different, some are 10 cm-20 cm, and some can reach 1 cm-2 cm.

For SLR digital cameras, the macro shooting ability is determined by the lens. Now almost every lens has macro function, but the macro function they refer to actually refers to the close-up ability of the lens. Generally speaking, the magnification of a lens must reach 1: 2 or even 1: 1 to be called a macro lens. Macro lens is the easiest macro shooting equipment to use, and users can use it immediately without adding any accessories. Generally, the highest resolution and contrast of a lens are displayed when the focus is at infinity, while the macro lens is just the opposite, and its highest resolution and contrast are displayed when the focus is at close range. So if you want to take high-quality macro photos, you must choose a macro lens.

In order to meet different needs, there are macro lenses with different focal lengths in the market, ranging from 20mm to135 mm. A wide-angle macro lens is often used with a telescopic cavity. 20mm macro wide-angle lens combined with expansion joint can make the magnification as high as 5: 1- 12: 1.