7. The Rule Of Five Hundred -

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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

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 phrase gained mainstream recognition as the title

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 7. The Rule of Five Hundred