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Use the camera’s “slow door synchronization” function to take interesting photos – IT Home



Slow door synchronization is an interesting photography method, mainly used forTake pictures of moving objects.

Slow gate synchronization requiresSlow shutter and flashCompleted with“Front Curtain Sync”and“Rear Curtain Sync”can form a smear in front or behind the object. Today we will talk about the shooting principle and precautions in detail, so that everyone can fully grasp the slow door synchronization shooting technique.

Slow Gate Sync is a basic function, which can be found in the camera’s menu settings. After opening slow door sync, you can choose front-curtain sync or second-curtain sync. (Different brands of cameras may have different names)

Let the car move forward slowly, and use “front curtain sync” and “rear curtain sync” to shoot respectively. (Note: Both kinds of shooting are to let the car move forward)

01,1st curtain sync

Set the shutter time to about 3~5 seconds, and the front curtain is synchronized. When the shutter is just opened, the flash will light up once to freeze the image of the object.Motion trails will be left in front of the object.

As shown below:

02,2nd curtain sync

Set the shutter time of about 3 to 5 seconds, the rear curtain is synchronized, and before the shutter closes, the flash lights once to freeze the image of the object.Motion trails are left behind the object.

As shown below:

Principle of slow gate synchronization

Let’s first review the slow shutter shooting, the object will leave a series of ghost images. Because during the time of taking pictures, objects will leave images, which is easy to understand.

But the object is moving, and the next moment it runs to another place, and the background is exposed.

During the time of taking pictures, both the subject and the background appeared in this position, so in the final photo, both the subject and the background can be seen, which is a superimposed state of virtual reality and real reality.

So, is the background more clearly visible, or is the subject more clearly visible?

It depends on who is brighter, the brighter the object, the clearer it will be in the photo.

So what can determine the brightness, there are two points,The first point isthe brightness of the object itselfThe luminous ones are often brighter than the non-luminous ones, so when taking pictures of the car tracks, all that is left are the tracks of the car lights, and no ghost shadows of the car body will be left.

The second point is the exposure time of the objectappearing in the photo for 5 seconds is brighter than appearing for 2 seconds.

After understanding this truth, it is easy to understand the principle of slow gate synchronization. The moment the flash was turned on, the car was very brightly illuminated, and the background was barely illuminated, so the car left a very clear image.

Therefore, when shooting slow door sync, whether it is front-curtain sync or later you sync, it is easier to succeed by doing the following.

First, ensure that the brightness difference between the background and the subject is large enough, and choosing a dark black background is more conducive to leaving a clear track for the subject.

Second, the flash can illuminate the subject and try not to illuminate the background, so the flash will only freeze the subject.

Third, choose a reasonable exposure time and coordinate the exposure time and the speed of the object’s movement. This requires repeated attempts to get an optimal value.

Fourth, control the overall exposure of the photo. If it is taken during the day, you need to install a light reduction filter, otherwise it will definitely be a waste of time.

In fact, not only flash can be used, but other lights can also be used instead, as long as it can illuminate the subject.

This article comes from the WeChat public account:Photography Institute (ID: shoujiPhotography)Author: Zhang Xiaozhang

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