blades

Here's an old-ish video that's been making the rounds again lately (viral videos are like viruses -- they don't go away very easily). Titled "Camera shutter speed synchronized with helicopter blade frequency," it shows what can happen when your camera is synchronized with the RPM of a helicopter's rotor blades. The resulting footage makes the helicopter look as though it's just floating in the air!

Modern DSLR lenses don’t usually have aperture rings, and opening and closing the aperture is the camera’s …

Here's an interesting look at what the aperture blades on a Canon 18-55mm (the kit lens for many DSLRs) look like. The video above shows the blades moving into position at 120fps. This happens every time you shoot a photograph and in the blink of an eye.