Not quite sure what you’re looking at? These seven Escher-esque airplane propellors were captured by iPhone photographer Soren Ragsdale, and while the resulting image is a bit mind-bending, no genius would find anything wrong with his iPhone’s camera sensor. Instead, the photo is just a trippy (but terribly neat) demonstration of the iPhone’s rolling shutter.
Here’s how it works. Unlike a film camera — which quickly opens its shutter and burns the resulting image into the ensconced film strip all at once — most digital cameras have a rolling shutter. An iPhone doesn’t take the picture all at once; instead, it works more like a scanner, starting from one side and — line by line — moving to the far end of the photograph.
Usually, this all happens so fast that you can’t tell the difference, but when you start adding in photographic subjects that spin faster than your iPhone’s camera can scan them, you get the weird reality bending of the image above.
The iPhone’s not alone in exhibiting this behavior: you’ll see this sort of sampling on pretty much every CMOS sensor camera on the market. A nightmare for professionals, surely, but for a consumer interested in Dali-fying his iPhone photos without downloading an app, it’s a pretty cool side effect.
[via Gizmodo]
