![]() ![]() The technique works on images of many focal lengths (up to about 200mm), but can be especially effective when photographing the Milky Way with a wide-angle camera lens.īrian Drourr used the 500 Rule to capture this stunning portrait of the Milky Way above Lake Moxie in Maine. The 500 rule can be useful when photographing the night sky on a fixed tripod. Setting the shutter speed for longer than allowed by this rule will result in images that do not have sharp stars. The 500 rule is used to measure the maximum exposure time you can shoot before the stars become blurry or before star trails appear. One of the best ways to combat star-trailing when capturing astrophotography images on a stationary (non-tracking) tripod mount, is to use the 500 Rule. Because the night sky appears to move from our vantage point on Earth, capturing a long exposure starry sky image on a fixed tripod may reveal star-trailing. One of the first challenges beginners face when getting into astrophotography, is being able to take a photos that is in-focus, with round stars.
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