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Slow door synchronization is an interesting photography method, which is mainly used to photograph moving objects.

The slow door synchronization needs to be completed by the cooperation of the slow door and the flash, which is divided into "front curtain synchronization" and "rear curtain synchronization", which can form a shadow in front of or behind the object. today, we will talk in detail about the shooting principle and matters needing attention, so that we can fully master the slow door synchronous shooting techniques.

Slow door synchronization is a basic function that can be found in the camera's menu settings. After opening the slow door synchronization, you can choose the front curtain synchronization or the rear curtain synchronization. (different brands of cameras may have different names)

Let the car move forward slowly and shoot with "front curtain synchronization" and "rear curtain synchronization" respectively. (note: in both shots, the car is moved forward.)

01, the front curtain synchronously sets the shutter time of about 3'5 seconds, the front curtain is synchronized, when the shutter is just opened, the flash will light up and freeze the image of the object. A track of motion is left in front of the object.

As shown below:

02, the rear curtain synchronously sets the shutter time of about 3'5 seconds, the rear curtain is synchronized, before the shutter is closed, the flash lights up and freeze the object image. A trail of motion is left behind the object.

As shown below:

Slow door synchronization principle Let's first review the slow door shooting, the object will leave a series of virtual shadows. Because during the period of taking pictures, the object will leave an image, which is easy to understand.

But the object is moving, ah, the next moment ran to other places, the background will be exposed.

During this period of time when taking photos, this position has appeared both the subject and the background, so in the final photo, we can see both the subject and the background, which is a superposition of virtual reality.

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

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

Then what can determine the brightness? there are two points. the first point is the brightness of the object itself. the luminous ones are often brighter than those that do not shine, so when shooting the tracks, what is left is the track of the lights, but not the virtual shadow of the car body.

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

Understand this truth, it is easy to understand the principle of slow door synchronization. At the moment when the flash was turned on, the car was illuminated very brightly, but the background was hardly caught, so the car left a very clear image.

So when shooting slow door synchronization, whether it's front curtain synchronization or later you synchronize, it's easier to succeed in the following.

First, ensure that the brightness gap between the background and the subject is large enough, and choose a dark black background, which is more conducive to the main body to leave a clear track.

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

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

Fourth, control the overall exposure of the photo, if it is taken during the day, you need to install a dimmer, otherwise it will definitely be in vain.

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

This article is from the official account of Wechat: photography Research Society (ID:shoujiPhotography), by Zhang Xiaozhang.

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