Shutter speed synchronized with helicopter blades makes for one freaky video

It may be the coolest helicopter video you see all day. Here, the videographer has set the capture rate of the camera (what most consider the shutter speed though that’s not actually the case) to synchronize almost perfectly with the blades of the helicopter. The results are freaky to say the least. Needless to say, the video has gone viral. https://www.youtube.com/watch?v=cxddi8m_mzk