There are several shortcuts on the iPhone, for which no instructions.
Sony a6000 has the fastest auto focus cameras with changeable lenses. New Sony Camera with changeable lenses ILCE-6000 allows sharp focus just 0.06 seconds.
Samsung Galaxy S5 is announced in February of 2014
Samsung Galaxy S5 on sale since April of 2014
The Canon EOS 600D sits somewhere in between the two camps, with a small form and entry-level styling, but including many features from the enthusiast Canon EOS 60D.