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11. stunning bass-string shot
2 years ago
Frequency of the bass strings and high shutter speed of the camera led to this surprising string-wobble footage.
There is no slowmo applied to the take. Sound is original.
Video was filmed with a Canon 5D MarkII, Nikon 50mm lens on 1,8f.
urbanscreen.com
There is no slowmo applied to the take. Sound is original.
Video was filmed with a Canon 5D MarkII, Nikon 50mm lens on 1,8f.
urbanscreen.com
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Avey
still, you need to set your shutter really fast, because otherwise motion blur will ruin the effect
looking at the flicker video posted below, it definitely looks like a (really amazing) rolling shutter artifact
Question, did you see this happening in the lcd/viewfinder?
it was funny.
At the top end the 5D Mark II can be set to an exposure time of 1/1000th of a second for video (or possibly higher, I don't have mine on, atm to check).
This is the same as taking a single frame at 1/1000th -- except that it takes 30 frames, each exposing for only 1/1000th of a second.
A Double Bass has a frequency (according to the intertubes) of between 40Hz and 200Hz. Something vibrating at that range of frequencies is easily 'stopped' by something capturing at 1/1000th.
Want to test it? Go grab a regular SLR, set it to 1/1000th exposure time, get enough light, and shoot a double bass being strummed. You'll see the strings vibrating there.
The 5D Mark II in video mode is just taking 30 frames per second, rather than one.
If, like with a camcorder, you set the 5D Mark II to use a more reasonable shutter speed (1/30th, or 1/60th, say) - then you'd notice the strings apeared more blurry.
It'd also smooth out the movement of the player's fingers, which appear jerky.
Simple. :)
I'm suspicious, too, since high-speed videos of strings being plucked look more like a pulse bouncing back and forth between the nut and bridge. youtube.com/watch?v=hRExwl11Upw youtube.com/watch?v=tZpeAJdD770
Of course after the pulse has traveled back and forth a few times it disperses into the harmonics of the string, but I don't think it ever turns into this very wavy shape (which would mean that only a single high-number harmonic was present).
if you set your shutter to 1/60th or so, motion blur kills the effect, that's why you need 1/1000th shutter or something like that
but the rolling shutter is absolutely indispensable, as it means that in these cameras, even though each pixel will be receiving light for 1/1000th of a second, it's not the same 1/1000th of a second for all of them: the bottom of the picture is taken around 1/50th of a second after the top of the picture was taken
this "frozen image, taken at different moments in time for different parts of the picture" is what gives you the effect
the other half of the equation is that, in order to get smooth movement out of a series of pictures like that, you need to synchronize your fps (24, 25, 30, 50 or 60) so that the start of each consecutive picture is taken at a point when the string is somewhat close to where it was at the start of the previous one
really, really freaky indeed
Pretty awesome. Got stuck once though. Little elbow grease and all was kosher.
Very interesting effect though! Thanks for uploading.
We actually encode up to 30fps for HD videos now, but this one was a little temperamental so it went through our older 25fps system.
And by the way, it most definitely is due to the CMOS being scanned and doesn't have much to do with slow motion other than the strings being sharp because the shutter speed was quicker.
see also "slink" a sculpture installation by jeff lieberman that uses strobes and a vibrating spring to produce some pretty amazing stuff that you can view with the naked eye. bea.st/sight/slink/
JJ
And come on people, this is obviously due to the rolling shutter. The image is scanned "slowly" from top to bottom, and as it moves down the string vibrates back and forth and is captured at different positions for each scanned line.
The string doesn't actually bend like that, it's just an optical illusion cause by rolling shutter, like this one: youtube.com/watch?v=LVwmtwZLG88
The strings are vibrating about 20-100 times slower than the shutter scan, so the image scan is not "slow" in relation.
And the string *does* bend like that. A simple experiment with verify this: Try shooting it with the string horizontal in the frame (in which case the shutter is not rolling along the length of it). You will get the same effect.
No one real string produce right angles or straight breaks.
And for the people that think this is caused by a rolling shutter: en.wikipedia.org/wiki/Stroboscopic_effect
At 0:09 where the strings are filmed diagonally, the waves are not symmetrical, and the frequency is not constant. A naturally vibrating string would have a symmetrical waveform and a constant frequency. So it's probably due to the rolling shutter.
this link explains it better
falstad.com/loadedstring/
BTW, awesome effect!
nice work btw!