Is the aperture good or small? What is the difference between a constant aperture and an unstable aperture? What's the difference between a large aperture and a small aperture? To put it bluntly.

The difference between large aperture and small aperture: the smaller the value, the larger the aperture. Conversely, the larger the value, the smaller the aperture. For example, F 1.4 and F2.8 are lenses with relatively large apertures. If you have money, of course you should buy this. The larger the value of F3.5, F4.2 or F5.6, the smaller the aperture. If you buy a lens with a small aperture, for depth of field and color reproduction, the larger the aperture, the shallower the depth of field, which will maximize the advantages of a large aperture.

Large aperture is generally used to shoot portraits, while small aperture is suitable for shooting large scenes and landscapes, depending on the photographer's creative concept.

Aperture, also called focal ratio, is a component used in camera to control the aperture size of lens, depth of field and imaging quality of lens, and control the amount of light entering with shutter. Sometimes it is also the concept of aperture value. The aperture size is expressed by f value. For the manufactured lens, the diameter of the lens cannot be changed at will, but the luminous flux of the lens can be controlled by adding a polygon or circular aperture grating with variable area inside the lens. This device is called an aperture. The larger the aperture, the greater the light input, the smaller the depth of field and the smaller the F value.