A nice video to boot your day, a guitarist (justkylevids on YouTube) apparently wondered what it was like being inside his guitar while playing, so he put his iPhone 4 inside his instrument with the video camera running and to capture some rarely seen footage of how the strings oscillate.
The awesome effect is further amplified thanks to the way the iPhone 4's shutter works, per justkylevids video description:
I just happened upon this trick when testing what it was like filming from inside my guitar. Note this effect is due to the rolling shutter, which is non-representative of how strings actually vibrate.
- You must have the strings brightly backlit to get the camera to capture at such a high frame rate (pure conjecture). You can see how the effect fades when the buildings come into view.
- Use a pencil
*This was used with the front facing camera, try the back camera, it may capture better!
In other words, the iPhone 4's CMOS sensor scans objects diagonally from the top left to the bottom right, producing the interesting effect.
Here's the video: