It is easy for some beginner users to understand that sensitivity will affect the brightness and darkness of the picture at the beginning, and they also know that sensitivity should be increased in low-light environments, so they blindly understand and remember, I need to increase sensitivity in low-light conditions . But the picture is bright, but the photo has a lot of noise. Is it because the camera is not good enough?
So, do you know what sensitivity means? How should it be used correctly in different environments? Why use the same camera, the night scene photos taken by others are much clearer than yours?
What is sensitivity?
Sensitivity is also known as ISO value. The definition of ISO in digital cameras represents the sensitivity of CCD or CMOS photosensitive elements. Sensitivity levels are multiples, such as ISO100, 200, 400, 800, 1600 . . . The sensitivity difference between adjacent ISOs is doubled, the higher the number, the higher the sensitivity. In a digital camera, the brightness of the photo can be changed by adjusting the size of the sensitivity, so the sensitivity has become a value that indirectly controls the brightness of the photo.
What does sensitivity affect?
1. Affect the brightness and darkness
In the case of the same aperture and shutter, the higher the ISO, the stronger the camera’s sensitivity, and the brighter the photos will be taken; Otherwise it will be darker.
2, affect the image quality
usually shoot in low light conditions, the sensitivity setting should be higher, but high sensitivity will increase the noise of the captured photos and reduce the picture The clarity and color depth. On the contrary, the lower the sensitivity, the less noise and finer the picture quality, but this situation is not suitable for shooting moving objects and low light environments.
Equipment: EOS R Shutter: 1/60 Aperture: f/4.5 ISO 400
From this point of view, the increase in sensitivity has advantages and disadvantages for shooting, so how should we choose the appropriate sensitivity?
Which environment is suitable for low sensitivity and high sensitivity?
If you are shooting under sufficient light, then you don’t need a too high ISO, because when the light is sufficient, the shutter speed and aperture are also easier to set, for example, in the setting When shooting with a large aperture, we can still set the ISO to 100 or 200 under sufficient light conditions to ensure the best picture quality.
If the light is not good and there is no tripod, you can only shoot in the hand. Even if the aperture is the largest, the safe shutter value is still not reached. In order to prevent the blur caused by hand-held shaking, when this is necessary, It is necessary to improve the ISO to shorten the shutter time to ensure the clarity of the picture. Although it is preferable to use a lower sensitivity setting in most shootings, taking a noisy photo is far more meaningful than a blurred photo under the above-mentioned necessary circumstances.
Finally, let’s summarize: the sensitivity, expressed by ISO, the smaller the number, the lower the sensitivity, and vice versa. The picture taken at low sensitivity is clear, and the picture taken at high sensitivity has more noise.
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