Among the flashlights used in SLR cameras, what is a light flash and what is a 2.4g flash?

Optical flash is also a kind of wireless flash, but optical flash is the simplest way of wireless flash. The flashing light is a bit like PC cable, only with trigger function, no TTL and no remote control. The advantage of flashing lights is that they are easy to use. As long as the flashing function of lights is supported, no matter what brand or model of flashing lights, they can flash with each other.

2.4g flashover refers to the wireless connection frequency of wireless flasher. Generally, the effective distance of 2.4g is about 10M.

Working principle:

According to the capacitance to be converted into strong light, it is usually divided into two types, one is boost capacitance, also called negative capacitance, and the other is main capacitance used for energy storage. The size of the main capacitor directly determines the energy that the flash tube can release. In this way, the flash energy is directly converted into strong light. Generally speaking, a 400 W/s lamp needs about four main capacitors larger than 400UF.

Extended data

Matters needing attention in using flash:

1, color temperature

The normal color temperature of flashlights is about 5600k, but the color temperature of flashlights produced by each manufacturer is different. Even if there are individual differences between products of the same brand, the use of soft light equipment and long-term use will also lead to the decrease of the color temperature of the flash. If you buy a group of light bulbs at the same time, you can measure whether their color temperatures are uniform.

2. Output power

The flash power of general professional studios is usually between 600 W-1200 W, the output power of some commercial lighting lamps is several kilowatts, and the photographic lamps of large commercial advertisements can reach tens of thousands of watts. For photographers and small studios, it is necessary to find a balance between sufficiency and economy.

3. Callback time

The recovery time is related to the continuity of shooting. Generally, the cycle time of flashlights below 1000W is within 1-5 seconds, and the cycle time of flashlights with higher output power will be longer. As long as it is normal within this range, there is no need to ask too much about the length of recovery time. Too short recovery time will bring a large capacitive load, and the hidden trouble will also increase.