Why doesn’t motion blur disqualify a photograph from TTG?

Because motion blur is as old as photography itself.

(Motion blur was proportionally more prevalent in the 1800s than it is today, because lenses were slower and recording-surface light-sensitivity was lower than today.)

• Genuine motion blur is so familiar to the public that it is not considered deceptive (see the P4 tab here)

• For many subjects — for example, a speeding race car or a waterfall — some motion blur often looks more realistic to viewers than the use of an extremely high shutter speed that makes the subject look “frozen still”

But note that TTG’s allowance only applies to blur caused by changes in the relationship between subject and camera.

Simulated motion blur produced by any means — on a computer, by zooming during the exposure, by using lens-mounted filters, etc. — renders a photograph ineligible to qualify as TTG.

For details, see the guide to motion photography