How to open an apple with a flash?

1, turn on the camera in the Apple phone.

2. Enter the lightning sign in the upper left corner.

3. Close at auto, open and close points.

4. When the camera shows off next to the lightning sign, the flash has been turned off. So there won't be a flash for taking pictures.

5. In addition, when it is turned on automatically, it will automatically turn on the flash to fill the light according to the lack of light in the surrounding environment. If the light is good, there will be no flash when taking pictures.

Turn on the camera, and there is a small icon like a camera on the upper left. Click to come out. Turn off three options manually and automatically.

If off, there is no flash. Manual means it is open. The automatic absolute flash cannot be turned on according to the brightness of light.

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Use of flash lamp

The electronic flash is sometimes called the perpetual flash. The illumination is high, but the illumination time is short (the illumination time is about 1/5000- 1/2000 seconds, so the shutter has no control effect on the flash. ), can be synchronized with the high-speed shutter (except curtain shutter and steel shutter), and can flash continuously, which is convenient for quick photography. It is the most used artificial light source.

Flash is a point light source, so the intensity of illumination is directly affected by the illumination distance, that is, the farther the illumination distance is, the weaker the illumination is (the degree to which the subject directly receives light).

We can use the flash by first determining the distance between the subject and the camera, and then calculating according to the formula "Flash Index (GN)/ Distance between the subject and the camera (M)= Applied Aperture (F)" to get the aperture that should be used at that time. For example, if the flash index is 24 and the distance between the subject and the camera is 3 meters, then we should use F8 aperture (24/3=8). Of course, we can also determine the aperture used in shooting first, and then convert the above formula into "flash index/aperture used = shooting distance" to determine the shooting distance.

(Note: ① The flash index is generally printed on the back of the flash; ② When using the flash, the shutter speed cannot exceed the maximum synchronous shutter speed supported by the camera, but the mirror shutter can be synchronized with the flash at any shutter speed; ③ Don't flash at the baby's eyes at close range, otherwise it may hurt the baby's eyes and cause serious consequences. )