What does the ISO on the film indicate?

Hope it helps.

ISO, i.e. the sensitivity of the camera. The film used in traditional cameras has different sensitivity, and the sensitivity of the film to light is also different depending on the ISO; Correspondingly, the DC also uses different ISO values to set the camera's sensitivity to light (Figure 1). DC has the same ISO value as traditional photographic film, which is an important parameter to control the amount of **.

The size of the ISO value is a measure of DC's sensitivity to light, and is usually expressed as an ISO value, with a higher value indicating stronger light sensitivity and a smaller value indicating weaker light sensitivity. Commonly used representations are iso, etc.

When we use a digital camera, we need to set the ISO appropriately. Generally speaking, under the same shooting conditions, the larger the ISO value setting of DC, the worse the ** image quality produced by DC, which is mainly reflected in excessive noise. Because most of the image sensors in DC are CCDs, each CCD element has its own inherent sensitivity.

When the amount of DC increases, the CCD increases the gain through the amplification circuit, but the negative effect of this increase is that the noise of the picture is also amplified accordingly, and the result is that the quality of the image becomes worse, which is what we often call the coarser particles. And the higher the ISO value, the coarser the particles.

Generally, when we shoot relatively static things such as landscapes, people, and macros, as long as the light allows, we can use a relatively low ISO, such as ISO100; You should also use a low ISO when shooting night scenes, and shooting with a tripod will be much better than shooting with the highest ISO directly.

When shooting momentary effects, such as sports competitions, live shooting, etc., in order to ensure the best clarity, the shutter speed must be increased. At this time, you can use a high ISO setting, such as ISO800; In order to prevent too much loss of detail, you can take a few more photos and then make adjustments. When shooting elderly people or workers, sometimes in order to show their weather-beaten faces or hands, we can set a high ISO to shoot, so that there is a lot of noise on the **, and the particles are relatively coarse, which can express a special effect.

in a traditional film camera.

, the ISO value indicates the sensitivity of the film.

There are two ways to represent the sensitivity of a film, one is ASA (American Standard).

and DIN (German standard), ASA and we are commonly used representations, such as ASA100, ASA200 ......, the value is twice as different, and the sensitivity to light is also doubled; DIN is expressed as din21=ASA100, din24=ASA200, and the difference in values is 3, and the sensitivity to light is doubled. Therefore, the name of ISO100 that we are used to is inaccurate, but it is natural to get used to it.

ISO in camera stands for sensitivity. It is also the abbreviation of the International Organization for Standardization, which is also the organization that quantifies the sensitivity of light. Sensitivity, a kind of indicator similar to the sensitivity of film, the ISO of a digital camera is achieved by improving the light sensitivity of the sensor or merging several adjacent light sensitive points.

Let me keep it simple.

ISO stands for light sensitivity and is expressed as a numeric value.

The higher the ISO value, the more sensitive it is to light, and this concept is derived from film. The chemicals in the film react chemically with light to retain the image. To achieve the same ** effect, the higher the ISO value, the shorter the time to see the light, in other words, the faster the shutter can be opened.

ISO was extended to digital cameras, and its meaning remained unchanged. For example, at dusk, the light is insufficient, and the same aperture shutter parameters are used as at noon, which cannot be normal**, the solution is: just increase the ISO value, which is why the camera auto mode will automatically adjust the ISO to 400 or 800 when taking pictures at night.

Of course, if the ISO is high, it will also have a negative effect, that is, the image quality will be reduced, and there will be a price.

ISO is the sensitivity in the camera. It is expressed as a numeric value. Such as ISO50, ISO

100, ISO200-3200, etc., the ISO value is the smallest, the better the image quality, the larger the ISO value, the image quality will decrease.

What is ISO? Do you know what sensitivity affects? The high sensitivity is so sensitive.

The ISO in the camera is the light sensitivity; It is used to indicate the sensitivity of the camera's charge-to-load device to light. The higher the ISO value, the more sensitive it is to light, for example, at an ISO of 1000, even faint light can make the camera sensitive to light.

ISO is a way to identify sensitivity, see Encyclopedia for details:

The sensitivity of the sensor is mainly affected by the sensitivity of the sensor to light, and the higher the sensitivity, the less light is needed to successfully capture the image.

Therefore, for digital cameras, the high sensitivity performance of the camera is very important for shooting in a relatively dark environment. A camera with high sensitivity performance can maintain a higher shutter speed than a sock in an environment such as night scenes.

However, the higher the sensitivity, the rougher the image quality, and the more color distortion, and the degree of deterioration is related to the grade of the camera. Generally speaking, the more high-end the camera, the better it is to maintain good image quality at a high sensitivity liquid light. It also has to do with pixels, the higher the pixels, the more difficult it is to maintain high sensitivity image quality.

National quality system.

In digital cameras, ISO indicates the speed of a CCD or CMOS sensor. The higher the ISO value, the stronger the light-sensitive device. The formula for calculating ISO is H*S=sensitivity, H is the amount of **), from the formula we can see that the higher the sensitivity, the less the amount of ** is required.

Deformation formula: H=, under the premise of the same ** amount, the ** time at ISO50 is twice the ** time at ISO100. Commonly used ISO values are iso50, ISO100 for use in good light situations, and high ISO values for low light situations.

In general, the lower the ISO value, the higher the quality of the photo, the more delicate the details of the photo, the higher the ISO value, the higher the brightness of the photo, and the quality of the photo will decrease as the ISO value increases, and the noise will become more and more serious, but the high ISO value can make up for the lack of light.

The ISO in the camera is not a sign of quality system certification.

ISO in camera means sensitivity.

Light sensitivity is the sensitivity of a film or image sensor to light.

The ISO in the camera is expressed as a numerical value. The minimum is 100 (some high-end models can be lower, up to 64 or 50), and the maximum is tens of thousands or even hundreds of thousands ......

The lower the ISO, the less sensitive it is to light, but the purer the image quality.

The higher the ISO, the more sensitive it is to light, but the more noise.

Based on the above characteristics, it is necessary to set the ISO reasonably according to the specific situation when shooting. Specifically, the following:

When there is enough light, try to use low sensitivity. This ensures a cleaner picture quality.

When the light is insufficient, it is necessary to compensate for the lack of light intake with high sensitivity. However, the ISO should not be set too high, so as not to affect the image quality due to too much noise.

Lighting conditions are good, but when shooting with a small aperture and a fast shutter speed, the amount of light may not be enough. At this time, you can appropriately open the height sense to ensure that the ** is accurate.

Generally speaking, it is below ISO800, and the image quality is pure, so you can use it with confidence.

When the ISO reaches 1600, the noise is more noticeable, so you need to be cautious when using it.

When the ISO reaches 3200, the noise is more noticeable, and unless you have to, try not to turn it on so high.

At ISO 6400, noise is particularly noticeable. Only as a last resort can you open such a high high-feeling ......

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