How to Calculate Camera Equivalent Exposures for Night Photography

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

Mount the camera on your tripod. "Do you want to know digital photography approaches that deliver skilled photographers to where they are today? Well, The Top Secret Photography Techniques could guide you out in doing so. To become spectacular photos we primary need to look at some basic photography strategies. The initial one I am able to share with you is find out about light. You can locate everything regarding photography techniques on , The Top Secret Photography Techniques. Each time you uncover about light and in what method it interacts with the direct environment then your photos will get more beneficial..". Take a meter reading using either the camera's meter or a hand-held light meter.

If 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.

For longer exposures continue to calculate the proper exposure length using the meter reading and checking that against your reciprocity failure chart.

Take 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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