The Messerschmit Bf109 was Germany's greatest fighter aeroplane of World War Two, and the 'F' variant marked the high watermark of the plane's development. This book describes and illustrates the development of the 'F' variants of the Bf 109, from 1939 to 1941. The author discusses the plane's development, the process of testing the prototypes and serial production. Each variant is specified and comprehensively described. The book contains scale plans, photographs and drawings from Technical Manuals, superb colour illustrations of camouflage and markings, rare black and white archive photographs and colour photographs of preserved aircraft.