Dean Potter Moonwalk

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Messages 41 - 45 of total 45 in this topic << First  |  < Previous  |  Show All  |  Next >  |  Last >>
MisterE

Social climber
Jan 28, 2013 - 04:30pm PT
Amazing production with very cool music.

Thanks!
Truthdweller

Trad climber
San Diego, CA
Jan 28, 2013 - 05:22pm PT
http://channel.nationalgeographic.com/channel/explorer/videos/the-final-jump/
Ed Hartouni

Trad climber
Livermore, CA
Jan 31, 2013 - 03:07pm PT
I talked a bit to Mike at the Facelift, great shot and great visualization for that shot.

While I have a lot less riding on my shots, I think the anxiety of getting it "right" is high all around, and once it starts to happen, you are there for the ride whether or not you got it right.

It is sublime when it is right! and the images in that short are stunning.

Basically, the Moon is effectively at an infinite distance, and has a 0.5 angular diameter...
to get a shot, you have to move the camera back so your subject, Dean's slackline in this case, has a similar angular extent. Easier to calculate this in radians rather than degrees, the Moon is 0.009 radians in diameter... if the slackline were 50' long, it would have that same angular extent as the moon if:

50'/d = 0.009

solve for d:

d=50'/0.009 = 5730' about 1.1 miles

you then setup the azimuth of the Moon at that time to give you the position, from the slackline, you have to be to get the shot... you can get the azimuth from a number of ephemera
Fletcher

Trad climber
The great state of advaita
Jan 31, 2013 - 03:22pm PT
Ed to the rescue! Thanks Ed.

Eric
Brandon-

climber
The Granite State.
Jan 31, 2013 - 03:24pm PT
Beautiful.
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