7. The Rule — Of Five Hundred

Example: For a 24mm lens on a Nikon crop sensor (1.5x), the effective focal length is 36mm ( ). The rule would be

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 7. The Rule of Five Hundred

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. Example: For a 24mm lens on a Nikon crop sensor (1