When is Nikon's "3D Tracking" focusing mode used?

3D tracking instructions:

In this mode, the camera will track the object that deviates from the selected focus and select a new focus as needed. It is used to quickly compose a subject (for example, a tennis player) that moves irregularly from one end to the other. If the subject deviates from the viewfinder, you can release the shutter button and put the subject in the selected focus to re-compose.

Extended data

Focusing skill

1. Select the autofocus point to make the camera move a little after focusing.

After the composition is completed, the autofocus point closest to the eyes is selected from the widely distributed autofocus points in the viewfinder for focusing. After the focus correction composition, the fewer times the camera moves, the smaller the chance of losing focus.

If the phase diagram moves after the focus is locked by the center, the focus shift (cosine error) will occur. The closer the subject is to the camera, the greater the error, which should attract more attention.

2. Combine various functions of different models to achieve more accurate focusing.

In recent years, the use of autofocus has changed a lot. It used to be common to focus on the autofocus point in the center of the viewfinder, and then move the camera to determine the composition with the focus locked. But now, the ranging accuracy of autofocus points other than the center-to-focus point has been improved, so the method of manually selecting autofocus points to focus has become the mainstream.

Using this method, the occurrence of cosine error can be suppressed and higher accuracy can be obtained. Users should get used to using the camera's autofocus function for manual selection, and need more practice to reach the level of quick selection as soon as possible.

Compared with the model using 35mm Quan Huafu image sensor, the model equipped with APS-C standard image sensor has a wider autofocus area in the viewfinder display range (shooting range).

Therefore, when using autofocus, APS-C model actually has more advantages than 35mm Quan Huafu model in cosine error. Surprisingly, few people know.

3. Change the ISO sensitivity to prevent jitter. The subject will shake unexpectedly, so it should be processed with appropriate ISO sensitivity.

After defocusing, subject jitter is the second biggest reason for the failure of portrait photography. The emergence of anti-shake mechanism greatly reduces the hand shake phenomenon, perhaps because of this sense of relief, photographers usually do not notice the subject's shake. The theme of portrait photography is people, and even if the subject does not move, those subconscious behaviors cannot be completely eliminated. Even the blink of an eye always happens at an alarming rate.

In order to "freeze" the object in the photo, the ISO sensitivity should be increased to obtain a high-speed shutter. For EOS series digital SLR cameras that will not produce noise even if the ISO sensitivity is high, you can actively change the ISO sensitivity when shooting with them.

4. Grasp the correct shooting rhythm and effectively capture the charming expression of the subject.

In portrait photography, we must pay attention to many aspects, such as facial expression and focus position. The focus is ideal, but the expressive force is not good, otherwise you can't successfully take a portrait photo. In order to reduce mistakes, take multiple photos in one posture.

Auto-focus and continuous shooting can be performed in groups of three. Each refocusing may not achieve the required focus, and it is difficult for the subject to master the shooting rhythm. Taking about three pictures at a time can make the model enter the state faster, so as to capture the satisfied expression and get the ideal focus. I hope that photographers can shoot rhythmically and reduce the risk of various failures.