How does Canon 70d perform multiple exposures?

Multiple exposures are complicated. See page 175- 178 of the manual for details, as shown in the figure:

: use

Multiple exposure is a shooting technique, but in order to set off the atmosphere, this technique is often chosen, and two or more exposures with different focal lengths are used to express the content that is difficult to express in a photo. Multiple exposure technology is generally used to take two or more photos.

It can be said that the multiple exposure function is the product of the film camera era. In traditional film SLR cameras, multiple exposure is a very important function and a unique photography technology. The principle of multiple exposure technology is to shoot multiple images on one film, so that an object can appear in the picture many times, and it can shoot magical effects out of nothing. This is its unique charm and attracts many people to use this technology.