Three elements of exposure

Three elements of exposure | shutter speed What is shutter speed-

Shutter speed: The device used in camera equipment to control the time when light strikes the photosensitive element is called shutter. Here, the time that light irradiates the photosensitive element is called shutter speed, and the unit is "seconds".

Exposure: Press the shutter button, the camera completes the process from opening to closing of the shutter curtain, and then make an exposure. The time from opening to closing of the shutter curtain is the shutter speed.

1/50, which means that the current shutter speed is 1/50 seconds, which is equal to 0.02 seconds. You can adjust the shutter speed by changing the value.

Influence of shutter speed on optical input—

The picture darkens: the faster the shutter speed, the shorter the exposure time, the less light entering and the darker the picture.

Brighten the picture: the faster the shutter speed, the longer the light input time, and the more light input, the brighter the picture.

Note: The premise is that the aperture and sensitivity ISO remain unchanged.

Some examples of slow shutters—

Slow speed and long light entering time;

When shooting in Ajida Island, Maldives, many people like to shoot the starry sky, but the first condition for shooting the starry sky is that the environment is dark enough. In order to ensure enough light, use a relatively slow shutter speed, but remember that the speed should not be too slow, too slow will make a star orbit.

Slow speed, forming a trajectory:

Shot in the Spring Festival of a certain year, near Xiangsi Lake, the shutter speed is slower than the time when the fireworks are exhausted. In the process of fireworks display, continuous exposure recorded the trajectory of fireworks display.

Some examples of fast shutters—

Fast speed and short light entering time;

Shooting in Semporna, Malaysia, when the sun was strong, in order to avoid damaging the camera sensor by long-term exposure, improve the shutter speed, reduce the exposure time, and ensure that the shutter speed is faster than that of the ship.

Quick freeze frame:

Photographed in Shanghai Disneyland, the rain cloud amusement project that creates speed belongs to the roller coaster type, which is very fast, so it needs to be faster to capture the freeze-frame picture.

Safety shutter of hand-held camera—

Safety shutter: refers to the slowest shutter speed of hand-held shooting under normal circumstances, so that the film is not blurred.

Theoretical calculation formula: safety shutter = lens focal length (which can be used as a reference value). For example, if a full-frame camera shoots with a 50mm lens, the theoretical safety shutter = 1/50.

Practical use: Because everyone's strength, camera posture and lens breathing rhythm are different, everyone's safety shutter is also different.

Your own safety shutter, still need to shoot more and practice more, sum up.

Shutter speed summary—

We can sum up the previous explanation in turn as three conditions for determining the shutter speed:

First, the ambient light is bright and dark.

1, strong light, use fast shutter.

2, dim light, use a slow shutter.

(The above premise is that the light type and sensitivity IS0 remain unchanged. )

Second, the moving speed of the subject.

1. Take a stop-motion picture and use a shutter speed equal to or faster than the moving speed of the object.

2. Shoot the motion trajectory with the shutter speed equal to or slower than the moving speed of the object.

Third, your own safety shutter.

In order to ensure a clear picture, the shutter speed is faster than the safety shutter.