The function of camera flash

1, strengthen the exposure, which can ensure that the picture is clear and bright in the dark.

2. When shooting outdoors, the flash can also be used as an auxiliary light source to emphasize the tone of the skin; When photographed under electric light, photos tend to show warm yellow and red tones. With the flash, the color temperature can be effectively adjusted, so that the color of the subject can be correctly restored.

3. Reflect light, without destroying the scene environment of the subject, and increase eye light; It can partially fill the light, reduce or increase the contrast, and instantly cure the subject.

4. Highlight the prospects. Use flash to exclude the background, because when shooting with flash, the shutter speed is high, and the background outside the projection range of flash will not be displayed due to insufficient exposure. Due to the flash lighting, the foreground is correctly exposed, thus highlighting the foreground and eliminating background interference.

Extended data:

Working principle of flash lamp

When the flash power supply is turned on, intermittent oscillation is formed by using the switching characteristics of transistor V 1, so that the primary of T 1 obtains AC voltage, and the secondary of T 1 obtains AC voltage greater than 300 V. The AC voltage is converted into DC voltage after half-wave rectification by diode D 1, which charges the main capacitor C2 and the trigger capacitor C3 to store energy.

When the voltage is charged to about 70% of the rated voltage, the neon light in the indicating circuit lights up, indicating that the flash lamp is in a normal flash waiting state. When the button AN is pressed, the trigger circuit generates a pulse voltage, and an instantaneous high voltage pulse is induced in the secondary of T2. The nitrogen in the Xe flash tube is ionized and conducted by the trigger electrode of the Xe flash tube, and the electric energy stored in the capacitor C2 is instantly converted into light energy by the discharge of the flash tube to complete the flash.

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