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When shooting in subdued light, classic photography method is to select a very low shutter speed (tens of seconds or even more) to reveal the faintest objects. Therefore, we will take just one long exposure. One alternative way to proceed, however, is to take several short exposures of the same scene and then adding them up with editing software like Photoshop. This technique offers a wealth of advantages, leading up to better images and greater creativity. The method of summing up several pictures of the same scene is conceptually simple. Just take as many photographs as necessary so that when summing them up, the scene will be lighted correctly. The light of each photo will add to that of the others. By adding an appropriate number of such pictures, the photographer can get a final image properly exposed. If you want to take a look at a more in-depth description of this method and an example, you can read our article. We can distinguish between two macro-cases. In the first one, we are taking a picture exploiting the already present natural ambient light. In the second case, we provide the main lighting. In the first case, the proposed method offers several advantages, but, in the second case, the benefits are even more. Just Ambient Light The first real macro advantage is that, due to thermal noise in CCDs, still digital cameras simply cannot offer arbitrarily long exposure time. That is why the authentic �B� pose does not exist in digital cameras. Therefore, the proposed method overcomes the problem of very long exposure, impossible with digital cameras. Another advantage in using the proposed method is noise reduction. Indeed, at least a part of noise is stochastic, which means that it can add to or subtract from the signal. If we sum many noisy images, we make a sort of average, so reducing noise. A third advantage is we can dismiss faulty images. In the sequence of images taken, some may be blurred by micro-movement of the camera (e.g. due to the wind) or imperfect in other ways. For instance, an airplane or a car passing by may leave an unwanted path of light. There could be zillions of reasons why an exposure could be faulty. If we take just one long exposure, we will end up with a useless picture. However, if we take a lot of them, keeping all of them short, we can dismiss some of the shots at the editing phase. This is even more so if the exposure requires some photographer's actions, like firing sequences of flashes. A fourth benefit arises fro...