Nighttime photography requires that you shoot with a fast lens or use flash to capture a moving subject. However, if a subject is not moving, for example, in a nighttime cityscape shot, you need only a steady tripod, and a reciprocity failure chart if you are shooting film, and you can take well-lit shots with exposure times longer than 30 seconds. Because all film suffers from reciprocity failure, where the film does not stay accurate to its box speed in long exposures, it adds an additional element that you will need to calculate in finding the correct exposure time.
Instructions
Instructions
- 1
Mount the camera on your tripod. Take a meter reading using either the camera's meter or a hand-held light meter.
2If the exposure must last a second or longer and you are using film, consult your reciprocity chart to find the correct exposure time. For instance, Kodak Tri-X 400 suffers from reciprocity failure at one second or more exposure. According to the chart, Tri-X has a reciprocity failure factor of 1.5 at one second and 2 at two seconds. That means that if the meter reads a two-second exposure, you must multiply the meter's reading by the reciprocity failure factor of 2; so Tri-X 400 requires a four-second exposure to get the same exposure level as a digital sensor would get at just two seconds. Digital sensors do not suffer from reciprocity failure.
3For longer exposures continue to calculate the proper exposure length using the meter reading and checking that against your reciprocity failure chart.
4Take the exposure. If you are using a digital SLR, check the exposure by previewing the image to see if the results are bright enough and take another exposure if you need to.
Nighttime photography requires that you shoot with a fast lens or use flash to capture a moving subject. However, if a subject is not moving, for example, in a nighttime cityscape shot, you need only a steady tripod, and a reciprocity failure chart if you are shooting film, and you can take well-lit shots with exposure times longer than 30 seconds. Because all film suffers from reciprocity failure, where the film does not stay accurate to its box speed in long exposures, it adds an additional element that you will need to calculate in finding the correct exposure time.
Instructions
Instructions
- 1
Mount the camera on your tripod. Take a meter reading using either the camera's meter or a hand-held light meter.
2If the exposure must last a second or longer and you are using film, consult your reciprocity chart to find the correct exposure time. For instance, Kodak Tri-X 400 suffers from reciprocity failure at one second or more exposure. According to the chart, Tri-X has a reciprocity failure factor of 1.5 at one second and 2 at two seconds. That means that if the meter reads a two-second exposure, you must multiply the meter's reading by the reciprocity failure factor of 2; so Tri-X 400 requires a four-second exposure to get the same exposure level as a digital sensor would get at just two seconds. Digital sensors do not suffer from reciprocity failure.
3For longer exposures continue to calculate the proper exposure length using the meter reading and checking that against your reciprocity failure chart.
4Take the exposure. If you are using a digital SLR, check the exposure by previewing the image to see if the results are bright enough and take another exposure if you need to.
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