It identifies the threshold where the movement of stars across the sky begins to blur into streaks rather than appearing as distinct dots in a long-exposure image. 2. Application and Adjustments
Example: For a 24mm lens on a Nikon crop sensor (1.5x), the effective focal length is 36mm ( ). The rule would be 7. The Rule of Five Hundred
While the basic rule applies to , modern digital sensors often require adjustments based on their specific hardware: It identifies the threshold where the movement of
The Rule of 500 is a formula used by photographers to calculate the (shutter speed) for capturing sharp, pinpoint stars without visible "star trails" caused by the Earth's rotation. The Formula: The rule would be While the basic rule
Shutter Speed (seconds)=500Focal Length of the LensShutter Speed (seconds) equals the fraction with numerator 500 and denominator Focal Length of the Lens end-fraction
Many modern photographers now use a "Rule of 400" or the more precise NPF Rule because high-megapixel sensors are more sensitive to tiny amounts of movement, making the Rule of 500 too "liberal" (resulting in slight blur). 3. Cultural Context: "1923" Episode 7