What do shutter, sensitivity and aperture mean? More detail

Shutter: Shutter is a mechanical device used by camera to control the effective exposure time of photographic film. It is an important part of the camera, and its structure, form and function are important factors to measure the grade of the camera. Generally speaking, the larger the shutter time range, the better.

Low seconds is suitable for shooting moving objects, so a camera emphasizes that the shutter can reach116000 seconds at the earliest, which can easily capture fast moving targets. However, when shooting traffic at night, the shutter time will be lengthened, and the silky water flow effect in ordinary photos can only be photographed with a slow shutter.

Sensitivity: sensitivity is the chemical reaction speed of film to light, and it is also the standard of sensitivity speed in film manufacturing industry. For the negative with low sensitivity, it takes a long exposure time to achieve the same imaging effect as the negative with high sensitivity, so it is usually called slow negative. Highly sensitive negatives are therefore called fast negatives.

Aperture: Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. Generally, in the lens, we use the f value to represent the aperture size.

Extended data:

Shutter speed: The unit of shutter speed is "seconds". The highest shutter speed of professional 135 cameras reaches116000 seconds. Common shutter speeds are:11/21/41/811/301/65438+. The shutter speed exposure of two adjacent stages is twice different, and we often say that the difference is one stage. For example, the exposure of1/60s is twice that of1125s, that is,1125s is one step slower or one step lower.

Sensitivity level:

Low sensitivity is lower than 1 and ISO800.

2.ISO800~6400 is moderately sensitive.

3. ISO6400 or above is high sensitivity.

Aperture type:

1, fixed

2. Variable types

3, cat's eye type

4. Iris type

5. Instantaneous

6. Shutter

7. Hole

Baidu encyclopedia-shutter

Baidu encyclopedia-sensitivity

Baidu encyclopedia-aperture