What is sensitivity and what is sensitivity

You know this at once, if you put it simply, as far as my experience is concerned, that is, the darker the light, the higher the sensitivity value must be to be able to shoot clearly**, but too high ISO sensitivity will cause too much noise.

What is ISO?The great god of photography popularizes the sensitivity and his understanding of photography!

Sensitivity refers to the sensor's sensitivity to light coarsely

Based on the ISO value of the sensitivity, we can understand how well the film or sensor perceives light. An ISO 100 sensor requires twice the amount of light to achieve the same level compared to ISO 200.

In order to get 2 times the amount of light, the shutter speed needs to be reduced by half (e.g. from 1 60s to 1 30s) or the aperture increased by 1 stop (e.g. from f to f 4).

Lowering the shutter speed is obviously not a good idea, as it increases the risk of blurring. So why can't we always use the highest sensitivity setting?

It's not just noise

The latter two issues are generally less noticeable than noise. Increased noise reduces sharpness and loss of detail. Iwaeda's reduction of contrast affects detail resolution in highlights and shadows.

Noise is always negative?

A lot of time has been spent studying the difference between low and high sensitivity**. It's hard to say which one is more appropriate – having some noise isn't always a bad thing and might make ** feel better.

Different cameras have different levels of noise.

Yes, different cameras have different capabilities to deal with noise, and the high sensitivity level of cameras has also evolved greatly in recent years. If you're using a portable digital camera, ISO 400 noise is likely to be about the same level as other cameras' ISO 3200. And if you use the best DSLR camera, even above ISO 800 is available.

Nowadays we may enlarge the maximum size on the screen to check. Don't forget, though, that the noise level should be at the actual size of the **. Honestly, what are the chances that you'll use a bigger ** than an A4?

It's mine. What is the maximum sensitivity that the camera can tolerate?

Shoot a set of different sensitivity settings with your camera** and check the noise level at common sizes to determine the maximum sensitivity that the camera can tolerate.

The effect of low sensitivity

In some cases, a small sensitivity must be used. Here are 3 examples:

1. You need to use a shutter speed of less than 1 2s to shoot running water. In this case, a minimum sensitivity is required, and if the minimum aperture is not sufficient, a neutral gray lens is also required.

2. Outdoors on a sunny day, you need to use a wide aperture (such as f to get a shallow depth of field effect. Most cameras should not exceed 1 4000 s or 1 8000 seconds of shutter speed, and try to set the sensitivity to ISO 100 or 50. If this is not sufficient, a neutral gray lens is required.

3. When using a flash. Even with the smallest output, the brightness of the flash is impressive. Use a minimum sensitivity, and increase the flash output if it's insufficient.

Regarding the meaning of sensitivity, the computer terminology is explained.

Sensitivity, which adjusts the camera's light sensitivity according to the intensity of the light source. For example, ISO 200 can be used for cloudy days, ISO 400 or higher for dark environments such as stage and concerts, and digital cameras have a similar function, which changes the ISO value by changing the magnification of the signal amplifier in the sensor chip, but when the ISO value is increased, the amplifier will also amplify the noise in the signal, resulting in coarse and fine particle images.

Sensitivity, also known as "ISO value", is a parameter that measures the sensitivity of the "negative" to light. The ISO displayed on the camera screen is the representation of the photometric power of the sensitive family in the camera. The higher the number, the greater the sensitivity of the setting and the more sensitive the camera is to light; The lower the number, the lower the sensitivity of the setting and the less sensitive the camera is to light.

Under the condition that the aperture and shutter are unchanged, the higher the ISO, the stronger the camera's light sensitivity ability, and the brighter the ** will be; Otherwise, it will be darker. But usually we don't use increasing the sensitivity to enhance the brightness of the picture, because high ISO will make the picture look grainy, and these particles are called noise.

In the film era, this "negative" was film, and this sensitivity was determined by the specifications of the film and was immutable, and different types of film had different sensitivity and lightness.

In the digital age, the "negative" is the sensor in your camera, that is, CMOS or CCD, and this sensitivity is variable, generally speaking, the better the quality of the sensor, the greater the range of sensitivity adjustment.

If a digital camera is compared to a living being, a machine with excellent light sensitivity is like a lion that can catch its prey with excellent vision even in the dark of night, and poor light sensitivity is like suffering from night blindness. The wide range of sensitivity means that at the same aperture, the same normal**, you'll get a higher shutter speed, which is good for capturing.