For photography knowledge, this tutorial on aperture is enough.

Basic knowledge of photography - aperture, the three elements of exposure

What is aperture——

Aperture is a device used to control the amount of light entering. Generally, mm is located on the lens. Inside, it consists of a set of blades that can be opened and closed. If you want to adjust the aperture size, you can directly change the F value.

The effect of aperture on the amount of light entering -

The larger the aperture F value, the less light comes in and the darker the photo.

The smaller the aperture F value, the more light enters and the brighter the photo.

The impact of aperture on depth of field——

Depth of field: the distance between the clear part and the blurred part in the picture. The smaller the depth of field, the blurry the picture. The larger the depth of field, the blurry the picture. Qingxi.

The larger the aperture F value, the greater the depth of field and the clearer the picture.

The smaller the aperture F value, the smaller the depth of field and the blurr the picture.

The effect of aperture on light source——

The larger the aperture F value, the longer the ray, and the light gradually turns into light.

The smaller the aperture F value, the shorter the ray, and the light gradually turns into a spot.

Note: We draw the above conclusion when the sensitivity S0 and shutter speed remain unchanged.

Example of the effect of aperture on depth of field——

Large aperture, light source changes into spot:

Work taken in a restaurant, the light in the room, at a large aperture With the blessing, it turned into a beautiful light spot, enriching the entire picture.

Small aperture, the light source becomes bright:

This is a photo of flowers, the sun is relatively bright, and the aperture of F/1 is used to produce a starburst effect. Radiant.

Summary of aperture knowledge points——

α. Aperture affects the amount of light entering (photo brightness):

The larger the aperture F value, the less light entering, and the photo The darker.

The smaller the aperture F value, the more light enters and the brighter the photo.

b. Aperture affects depth of field (the degree of background blur):

The larger the aperture F value, the greater the depth of field and the clearer the picture.

The smaller the aperture F value, the smaller the depth of field and the blurr the picture.

c. Aperture affects the light source (spot/ray):

The larger the aperture F value, the longer the ray, and the light gradually turns into light.

The smaller the aperture F value, the shorter the ray, and the light gradually turns into a spot.