What kind of camera flashes?

There are several types of camera flash:

1) Built-in flash: Generally, 135 SLR cameras, APS cameras and video cameras are equipped with built-in flash, and GN varies according to different cameras. The GN of 135 SLR is about 12. In some top 135 SLR cameras, there is no built-in flash, such as Nikon's D2X and Canon's 1DS MAKR 2. Because the index is small, the built-in flash is not widely used. The place that the author uses most is to fill the light with a flash when shooting portraits. Using the built-in flash will inevitably lead to a lot of power consumption, so frequent users should always prepare spare batteries.

2) External flash: generally, it is a flash specially customized by camera manufacturers for their camera products. The characteristics of this flash are as follows: A. The flash index is large, usually between 18-56, which can be used for shooting more scenes. B. flexible use and enhanced operability. Usually, this kind of flash is connected through the camera's hot shoes or special flash socket, and those without hot shoes can be connected through the flash synchronization interface. The operation is more flexible, and it can control the output of flash quantity and change the direction of flash. Even some advanced flash lamps can be operated by wireless remote control outside the machine.

3) Large flash: Large flash is generally used in photo studios, photo studios, photography studios and other occasions. This kind of flash lamp is characterized by its extremely large output power. The flash index is not used to calculate the flash amount, but Ws (Watt/sec) is used instead. Generally speaking, 400ws is equivalent to a flash index of about 56.

4) Special flashlight: refers to an unconventional or uncommon flashlight designed for some special purposes. There are two main types:

A. Ring flash: used for close-up or macro photography, widely used in medical photography.

B. Underwater flash: As the name implies, it is used for underwater photography and has good sealing performance and pressure resistance.