Does the camera flash need metering? If necessary, how to measure light is 500D, whether to measure light first or set a custom white balance first! Novice, please answer.

Yes, the general built-in flash of the camera has TTL photometry capability, that is, the exposure value is obtained by flashing in advance, and then the accurate flash is emitted according to the calculated value. When the flash is used for automatic white balance, the color temperature will be automatically adjusted to 5500K (flash color temperature), so don't worry.

When using external flash lighting, especially when using more lights, you can use a separate exposure meter. There are flash exposure meters on the market, each of which costs 2000 ~ 4000 yuan, which is unnecessary for personal use.