What do flash control flash time flash index mean?

1. Flash index: It refers to a measure of the ability of a flash lamp to illuminate a target with a certain sensitivity and viewing angle. A flash lamp with a high flash index has a higher irradiation power.

2. Flash control: refers to power step-by-step control, but here it is marked as .3EV, and the range includes full power to 128th power (aperture), and the maximum time is 2th of a second.

3. Flash time: the actual light-emitting time, which is 1/2th of a second (5ms) at full power and 1/2th of a second (.5ms) at the shortest.

extended information

an obvious use of the flash is to supplement the light when shooting, that is, to artificially increase the illumination of the subject when the natural light conditions are insufficient. Another purpose of flash is to distribute light during photography. By arranging the position of light and projecting, the interest of photographic works can be increased or the quality of photos can be improved.

Multi-lamp cooperation and the use of off-camera flash greatly enhance the creativity of photographers. For another example, with the help of high-speed stroboscopic flash, the movement track of an object can be recorded for a period of time, which can provide scientific research. As far as these two purposes are concerned, the flash is not the only means, and the reflector or the normally bright artificial light source can also be used.

Flash is more like a compromise between the two, small and light, with high luminous power and low energy consumption, which is not affected by natural light. Mature photographers will choose according to their subjects, environment and their own usage habits.

Baidu Encyclopedia-Flash

Baidu Encyclopedia-Flash Index