So, what are compact system cameras? Part point-and-shoot, part digital SLR, they deliver smaller form
factors while maintaining many of the features—such as a larger sensor, and interchangeable lenses—that
make a DSLR desirable. The technologies behind this performance vary; Panasonic Lumix G Series and Olympus PEN cameras share the
Micro Four Thirds format, while Sony NEX, Nikon 1 System and other cameras feature one-of-a-kind systems.
What
allows a compact system camera to be, well, compact? Unlike a digital
SLR, there's no reflex
mirror system inside, which is one reason
