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
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
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 Many modern photographers now use a "Rule of
For cameras with APS-C sensors (like most entry-level DSLRs), you must first multiply the lens focal length by the camera's "crop factor" (usually 1.5x or 1.6x) before dividing. The rule would be It identifies the threshold