Multiple exposure is simply multiple exposures of the same frame. At multiple exposure, the matrix or film is exposed several times. Speaking quite simply, the camera “photographs” several times, and the result is just one image, with all the individual photos combined on one. How it looks – see in the examples.
When taking a picture using the multi-exposure effect, the queue of exposures itself (the queue of photographing) is indeed repeated for the same picture on the film cassette. In digital photography as such, “pure” multiple exposure cannot be, since the initial product of each shot is a digital image file. But at the same time, multi-exposure on digital cameras is implemented in software and achieves almost the same effect as on film, and sometimes much better or worse. In digital cameras, multiple exposure is realized by combining several shots into one, and the camera may or may not make some adjustments to the overlay image. In this article, it is the multi-exposure on digital cameras that is more affected, because I simply have no experience with the film.
Multi Exposure Exposure
For the film, it was necessary to calculate the exposure for the total final frame more difficult than for each frame separately. If the film is just to take several pictures with normal, for each of them separately, exposure, then the final image for a multiple exposure will be overexposed (overexposed). Therefore, each individual frame on the film in a series of frames for a multi-exposure had to be done taking into account the exposure of the film to other images. Also, on the film it was possible to do ME on a negative or positive. In digital photography, everything is much simpler – you need the number of shots with a normal exposure (for each frame separately), and the camera after the last shot simply combines them into a finished image.
Multiple exposure (ME) on the CPK (digital mirror cameras)
Many modern cameras have such a function, for example, I used ME on my Nikon D90, D80, D200 cameras, but on the little Nikon D40 there is simply no multi-exposure. Cheaper cameras, like my Nikon D90, D80, have the ability to do multiple exposures in just two or three shots. The more advanced Nikon D200 can take a picture in multi-position mode from 10 individual shots. During the multiple exposure mode, the camera will alert you with a corresponding indicator on the display or in the viewfinder — on Nikon cameras, this is an icon with two overlapping rectangle images. Multiple exposure can be turned off at any time, if not the whole number of shots was taken in multiple exposure mode, the camera will simply save them separately. If a multiple exposure is carried out completely, then the final image will be only one shot. It is rather strange that the camera can save a picture with a multiple exposure in the RAW format, the question pops up, and what kind of RAW (raw data from the matrix) is it if the camera itself “stitched” one image from the others.
The problem with some CCD cameras is the fact that the multiple exposure is turned off automatically after a certain time. On my Nikon D90, D200, D80, multiple exposure is turned off after 30 seconds. This drawback will not allow me, for example, to shoot one frame of the city in the DOE in the morning, and the second in the evening, to create an interesting effect. In this regard, film cameras and ME with software (software, like Photoshop) are much more effective. Although you can cheat and use the overlay function in the camera, though not all cameras are able to. Then, you can shoot anything and anytime without ME mode, and then apply frames to each other.
Number of frames in multiple exposures
In general, a multi-exposure requires at least 2 frames, therefore it is also “multi” – “many”. Maximum unlimited. But on digital cameras, it is usually worth limiting the number of frames to create a multi-exposure frame. For Nikon, this is usually 3-10 frames. The number of frames is just an advantage over the software method, since each photo in Photoshop will have to be added to the ME-frame manually, and the camera will do everything itself.
Multiple exposure using a computer
The effect of multiple exposures can be very easily implemented in a graphic editor. The method is very simple, you need to make several frames that need to be merged into one, and then with the help of layers and their transparency, put on each other. Moreover, the graphic editor will allow more flexibility to control overlay, accents and other parameters in the photo. Another advantage of the method of creating a picture with a multiple exposure is the ability to create a multiple exposure from any number of shots while preserving the originals.