A runner very blurred in her race at Palmer, Alaska

Handheld at 80mm for probably about 1/15th shutter speed. How is the

result? Thanks in advance for all comments

This was WAY longer than 1/15th. I've used 1/15th to pan much faster-moving objects (cyclists), and the pan-lines were only about a quarter or less than what you have there. If we assume (very conservatively) that the cyclist was travelling twice the speed of the runner, and the pan lines are 1/4th the size, that means your shutter speed was 8 times longer than 1/15th, so more like 8/15 ie around 1/2 a second. This would still seem conservatively short, because you can see that the runner has almost completed two strides, which would take longer, unless sprinting.

I like this very much, especially the lines made by the feet. Quite interesting.

I like this one better