What's the difference between a flash and a constant light? Why not use constant light photography?

Mainly the difference in luminous time and luminous intensity.

Compared with constant light, the flash used for photography is easier to obtain high quality. When the brightness is high, you can shoot with a low iso+ small aperture, which preserves a lot of details. This is very important in high-end commercial photography.

1, luminous time

Always on, as the name implies, is always on; So:

Constant light intuition

What you see is what you get, so you can distribute light more quickly and accurately. Getting started is also simple; You can't use Flash directly without some basic knowledge.

When the ambient light is dark, focusing under constant light is more efficient and effective.

Hengguang Expressway continuous shooting is easy.

Flash charging, with call back time, the top flash is almost 10fps (not at11power, the greater the flash power, the longer the call back time), but the price is very expensive. Only the experimental party will make videos with photos of Fu Bao. Generally, high-speed continuous shooting is not considered in flash.

2. Illuminance

Flash is explosive, and its brightness is much stronger than that of a constant light source.

Flash lights make it easier to dim spotlights.

High power means that more possibilities can be made in light ratio. For example, dimming sunlight is a patent for flash lamps.

The flash can be put farther and the composition is more possible.

Extended data:

The luminous time and intensity also determine other characteristics:

1, fever

Flash is instantaneous high temperature, full power and even direct burning of pasted color films and even lamps ... (household lamps are particularly easy to burn). But the flash at least has no effect on people and the environment;

Because of the luminous intensity, the constant light sometimes approaches the model, and sometimes there are two lights with hamburgers. The model is very hot, on the one hand, the makeup falls off faster, on the other hand, the state is easy to get worse.

2, freeze-frame ability

The actual lighting time of the flash varies with the power of the flash, but the overall time is very short. Take Canon 580EXII as an example. When the brightness is11,the flash time is11000 seconds, and when it is1128, it is 65438.

The external power is large, and the indoor ambient light can be almost ignored in flash photography. Whether the shutter is110 or1100, the flash moment is recorded. By the way, the picture quality will naturally not be too bad.

On the contrary, although the framing ability of constant light is not as strong as that of flash, it can record the motion process, such as afterimages, and it depends on constant light.