The D7000, like all system cameras, has a mechanical shutter it uses when taking photos. Even though technically ”rolling” as well, it is much faster than a typ

The D7000, like all system cameras, has a mechanical shutter it uses when taking photos. Even though technically ”rolling” as well, it is much faster than a typical electronic shutter due to the way a CMOS sensor must be read out. Phone cameras have no physical shutters and use e-shutter all the time, but your D7000 only resorts to it when shooting video. As a rule of thumb, it takes several milliseconds for a mechanical shutter to traverse the sensor plane, but it takes several tens of milliseconds for an e-shutter to readout the sensor. Shutter speed does not affect this; even at 1/4000s or 1/8000s or whatever the time difference between the top and the bottom of a photo remains the same.