What does the external flash of SLR do? What are the advantages compared with the self-contained flash?

The functions and advantages of SLR external flash are as follows:

1, the set-top box flash of the SLR camera is folded in the protruding parts of the five prisms of the set-top box, and the height of the lamp holder is limited. When a SLR camera uses a telephoto lens, the telephoto lens and its hood will block the light emitted by the dome light, thus creating an arc shadow at the lower part of the picture.

However, because the external flash is high enough, the long lens and its hood will not block the light.

2. The self-contained flash of the SLR camera is powered by the battery of the fuselage. Considering the power consumption, the general flash index is only about 8- 12. The external flash is loaded with 2-4 AA batteries, and the flash index is as high as 24-60, so the lighting distance is far.

3. The lamp holder of the SLR camera with its own flash cannot rotate freely, and the lighting direction always faces straight ahead. Single-lamp frontal lighting in portrait photography is easy to make the face lose its three-dimensional sense, and annoying shadows will appear in the background. The lamp holder of the external flash can be rotated up and down more than 90 degrees, which can create a lighting atmosphere similar to natural light, add a three-dimensional sense to the face of portrait photography, and effectively prevent background shadows.

Extended data:

Skills of using external flash:

1. Be sure to pay attention to the angle of light in the direction of the external flash lamp holder. Using the law of reflection, it is best to make the light fall on the object after reflection. This can't be adjusted in an instant, it needs to be adjusted slowly.

Never look at glass, mirrors or other objects with strong reflection when flashing, which will destroy the feeling of the whole picture.

2. Sometimes a flash may not achieve the best effect. At this time, the number of flashes can be increased through the wireless flasher, and multiflash can fill the light from different angles and directions, so that the shooting effect will be more stereoscopic.

Reference source:

Baidu encyclopedia-external Flash