Divide 500 by the focal length in 35 mm terms to get the maximum number of seconds of exposure without noticeable blurring.To obtain a natural looking starry sky the exposure must be less than the time it takes for the stars to noticeably streak. Just as motion blur occurs when the shutter speed is too slow for a moving subject the long exposures needed for night photography allow the earth to rotate enough to streak the stars: no kidding! Photo 2: Starry Sky – Single 30 Second Exposure The first thing to decide is what kind of sky image to capture. And, starting with a sequence of shots it is possible to combine them into a time-lapse movie, or into a single image. It is possible also to combine multiple exposures with different illumination in each. ![]() If the exposure is long, the photographer can even move through the image while it is being exposed and illuminate different parts of the scene in different light. In the same way long exposures allow for illumination of key parts of an image with a flashlight, headlight, candle light, or glow stick. For example a flash, or combination of strobes or gels can be used to illuminate a scene to dramatically alter the strength and direction of the light. Many kinds of images are attainable at night or in low light that cannot be obtained under “normal” conditions. The camera can also “see” wavelengths (colors) that the human eye cannot – for example, infra-red and ultraviolet. Because there is so little light it takes a long time to collect enough photons to reveal what is there. The amazing photographs from the Hubble Space Telescope are sometimes created by exposing the sensor for minutes – or hours – at a time. Although our eyes can not see color in the dark or collect photons (light) over long periods of time the camera can. The chair still remains in the dark room as is painfully clear when “discovered” by means of the shin. Turning out the light does not make a thing go away. Our eyes only discern shades of gray in low light, but the camera sees color. Obtaining images at night or in very low light conditions can be surprising and rewarding. The camera reveals things that the unaided human eye cannot see. Preparing the Photographer for the Night.Some star trail related tips also apply to other low-light photography scenarios. Steven Christenson: My What Big Headlights You Have Ī compendium of tips learned while taking images like those shown in the Image Gallery and the figures below. ![]()
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