Double Exposure by definition, combines two images into one in such a cohesive manner, so that it looks as if one fades into the other. Just like the image below. The two faces have ovlerap, in which each image is visible and yet partly faded into the other.
Although, the above image uses photoshop to create the colorized effect (black & white, with red accents via photoshop masking layers), The Double-Exposure effect here, is present in the image's RAW file. Of course, it can be done using photoshop, but perhaps, you don't wish to pay for photoshop or any photo-editing software, or perhaps you don't consider yourself a very tech savvy person. Regardless of what the reason might be, its not too difficult to create an image like the one below, with just a camera and an off-camera flash.
The first thing, you must do is significantly decrease your camera's shuttersped ( I would recommend at least opening it up to 1"). And in case you are unfamiliar, a bigger shutterspeed, means longer exposure, which means more light is being let in per image.
The next thing you must do is set your off-camera flash to "multi" setting, and make sure the flashes per second is relatively quick. Having multiple flashes per each camera exposure, is the best way to ensure double-exposed images. Lastly, you will want ot drag eiither youre camera which will create an image such as the one below (preferably dragging it in-between flashes), to create the effect of two overlapping images. Or... if you prefer something like the image above (in which there is more blur, and less understanding of where one image ends and the other begins), then you can have quicker multi-flash, and have youre subject move as opposed to moivng the camera itself. In the image above, the subject has rotated their head which has created this blur of many different images, as opposed to just two.
To make it simplifer, in order to create double or multiple exposure image, you must have a light flash at least twice for the length of time in which the camera is exposed. If you're camera is open for one second, you're flash must go off less than 0.5 seconds apart.
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