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Sony NEX-7 review @ Imaging-Resource

" The NEX-7 offers significantly improved performance over the NEX-5 in a couple of key areas. Sony claims prefocused shutter release lag of just 0.02 seconds (we measured 0.022s in the lab), which it says is not only five times faster than that of the NEX-5, but the fastest of any

interchangeable lens camera.

Burst shooting is equally swift, with a maximum rate of ten frames per second (manufacturer spec) possible in the Speed Priority Continuous burst mode, which locks focus and exposure from the first frame. Burst depth in this mode is rated by Sony as 17 fine or 18 standard JPEG frames, 13 RAW frames, or 11 RAW+JPEG frames. In the lab, it performed even better with longer bursts.
 
Dust reduction. As with the NEX-5 before it, the Sony NEX-7 includes a two-pronged dust reduction strategy, with a charge protection coating on its low-pass filter that aims to prevent dust adhering in the first place, and the ability to vibrate the filter to shake free any stubborn particles that manage to adhere despite the coating. Sony describes the latter system as being new, although it hasn't detailed precisely what changes have been made. (We do note that it is now using the term "ultrasonic vibration" in its marketing materials for the NEX-5N, however, and given that the dust reduction cycle is no longer clearly audible, that suggests that it has probably increased the vibration frequency.) 
 
The NEX-7's dust reduction system operates when the camera is switched off, which helps to reduce the startup time, while not relying entirely on the user remembering to manually trigger a dust reduction cycle. It is, however, possible to perform a cycle manually through the menu, if desired."