Handholding a camera introduces tiny shakes, and the longer the lens the more those shakes magnify into visible blur. The reciprocal rule gives a safe starting point for the slowest shutter speed you can handhold: use one over the full frame equivalent focal length in seconds. This calculator applies that rule using your focal length and sensor crop factor, so a 50mm lens on a 1.5x crop body needs about one over 75 of a second. It also lets you factor in image stabilization, adding the stops your lens or body claims, since modern stabilization can buy several extra stops of steadiness. Enter your focal length, pick a sensor, and set your stabilization, and it returns the recommended minimum shutter speed. This helps you avoid soft shots in low light and decide when you truly need a tripod. All calculation runs in your browser with nothing sent to a server.
Handholding a camera introduces tiny shakes, and the longer the lens the more those shakes magnify into visible blur. The reciprocal rule gives a safe starting point for the slowest shutter speed you can handhold: use one over the full frame equivalent focal length in seconds.
Yes. Reciprocal Shutter Rule Calculator is completely free, with no sign-up and no usage limits.
Yes. Reciprocal Shutter Rule Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Reciprocal Shutter Rule Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.