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.
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Here’s an interesting glimpse into what a DSLR’s aperture blades and shutter curtain look like in super slow motion. Specifically, it’s a Nikon D3 shooting at 11 frames per second with 1/4000 shutter speed and f/16, all captured at 5,000 frames per second. What’s amazing is that the shutter curtain moves so quickly that you can’t see the sensor at all, even at 5000fps!