What does the reciprocity rate in photography mean? An introduction to the reciprocity rate in photography

1. The reciprocity rate refers to the image density generated when the photosensitive material is developed, which is proportional to the exposure duration and light intensity.

2. The function of aperture and shutter is to control the amount of light. Camera lenses are marked with f2.8, 5.6, 8, 11, 16, etc. This is the aperture coefficient. The larger the coefficient, the smaller the aperture; the smaller the coefficient, the larger the aperture. Shutter speed is the abbreviation of a fraction of a second, such as 125 for 1/125th of a second. Shutter and aperture are in a cooperative and complementary relationship, which is the commonly used reciprocity rate.

3. The reciprocity rate refers to the image density generated when the photosensitive material is developed, which is proportional to the exposure duration and light intensity. However, when the light intensity is abnormal and the exposure time is extremely short or long, this law breaks down, making the results difficult to predict, hence the term "reciprocity failure." If you want to keep the exposure constant, if you open the aperture one level wider, the speed will increase one level; if you reduce the aperture one level, the speed will slow down one level. For example: use aperture 11 and speed 1/60 second. When the aperture is changed to 8, the speed will be changed to 1/125 second. When the subject requires a certain depth of field, the aperture size should be given priority. If the background of the subject is cluttered, use a large aperture to blur the background; if you are shooting a panorama, use a small aperture so that there is enough depth of field to show the whole picture. When shooting moving objects that require movement and speed, you should first consider the shutter speed and then match it with a suitable aperture.