My own photography is too long. How do I divide it?

Generally used in film SLR cameras, it refers to the second exposure or multiple exposures on the same film. The specific method is this. For example, first take a picture of the sea, the upper part has no scenery or the same color is best, and then use the upper part to take pictures of the moon or sunset. Similarly, the requirements for the lower part are the same as above. If there is no way to control the background, you can cover the upper lens or the lower lens as needed to complete the above shooting, which requires many exercises. I wish you success!