Lowest shutter speed but no motion blur

Started 3 months ago | Discussions thread
JimKasson Forum Pro • Posts: 28,210
Re: Lowest shutter speed but no motion blur

DigitalFFUser wrote:

How to determine the lowest shutter speed that doesn't cause motion blur? In other words most optimal shutter speed for a given situation. One can use a very high shutter speed but that will limit the amount of light.

First compute the magnification. Then decide what is an acceptable amount of linear motion at the sensor (in the image space). Estimate the subject speed laterally. Multiply that by the magnification. Then pick the shutter speed that will barely allow the acceptable amount of linear blur.

This is similar to the way to get DOF from deciding on what an acceptable circle of confusion at the sensor is.

I'd start with a blur threshold at the sensor of 10 to 50 um, but in many situations, more blur than that is acceptable.


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