What is "explosive" in photography?

When you say explosion, you should mean explosion effect, that is, zoom shooting. When shooting, focus on the subject, shutter 1/30- 1/60 seconds, and the aperture is determined according to the camera's photometry. At the same time, press the shutter button and rotate the lens to zoom (from telephoto to short focus or from short focus to telephoto). The whole process should be done in one go without stopping. If the shutter speed is fast, it won't work. This kind of kung fu is difficult to master. Practice makes perfect.