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How can high shutter speed be so hard? The shutter leaves travel at the same speed, whether it's a one minute or 1/8000 second exposure. One shutter blade starts traveling, and at the predetermined moment the second shutter starts traveling the same path. The *only* difference is the size of the sliver of light as it travels over the sensor. Again, the speed of the shutter leaves, blades, or whatever you want to call them, remains constant, with only the size of the slit changing. This traveling slit of light is what makes baseball bats "curve" in photos.
Shutters are like life. Some people die at birth, some in childhood, some as young adults. Most make it to a long life. The "fickle finger of fate" is in charge here. Granted, poor design or sloppy manufacture can shorten shutter life, but Canon and Nikon have been making shutters for a long time and literally have it down to a science.
Here's a video on youtube. Watch closely and you will see one curtain open, then the second follows the same path. The time between the two curtains moving is what determines shutter speed, not the speed at which the curtains travel.
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