A type of camera:TLR
In short, the Rolleiflex 2.8F is everything a TLR camera could  and should... [DOC] [TLE] Types of Cameras [PAR] In the past, with film and chemical based systems we had: viewfinder cameras, 
rangefinder cameras, single-lens reflex or SLR cameras, twin-lens reflex or TLR... [DOC] [TLE] introduction to Medium Format Photography - Ken Rockwell [PAR] Medium format cameras use film much, much bigger than 35mm or digital, and 
thus ... format for many kinds of professional photography, especially portraiture.