I agree it's a challenge, but that's what makes it fun. I'm only risking time and film.
Alas, I won't be in London for the race. I'll be in New Hampshire next week and will experiment. Thus the request for guidance.
For those who may not know, there are seven "major" world marathons. She's knocked off the US ones (NY, Bos, Chi); did Berlin last year. Leaves only London, Tokyo and Sydney.
My sincerest thanks to all.
Charley
I like the idea of timing the exposure so that her leading foot just hits the ground and is relatively still, contrasted with the rest of the body in motion. And should it be the near or far foot from the camera?
So how long is one foot on the ground? Interesting...
Perhaps we don't need the actual Eadward Muybridge after allIf running at 10 mph over the ground, the runner has horizontal motion of 176 inches per second...the foot on the ground is -176 ips relative to the runner's waist at 0.0 ips if body motion is neutralized by panning at the same rate as forward motion. So if shooting at 1/100 the waist is motionless (ignoring any vertical motion seen in someone jogging) and the foor on the ground is moving -1.76" during that 1/100 shutter open time. You can do the rest of the calculations per your chosen shutter speed...e.g. foot on the ground is moving -5.87" relative to the runner's waist assuming 1/30 shutter.
So about 1/8 second, with the ground-touching foot closest to the camera so I have the other leg making a full motion forward blur behind.We need Eadweard Muybrigde on it.
Thanks for the suggestions. Background blurring is the easy part. I had meant, but neglected to say, that I was looking to perhaps blur hands and feet.
Yes, 1/30th was where I was going to start.
I'm musing about different focal lengths as whether I can get foot blurring with no background blurring.
It's a pain to photograph marathoners, as you've got to snap a picture, then get into your car and drive a mile down the road for the next shot.
As to similar weather conditions, well, she's in New Hampshire, where there's still 3-4 foot snow plow piles along the roads.
Charley
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