The canon EF 40mm f/2.8 stm is a lens with a fixed focal length on the market starting from the year 2012 thus becoming the first lens pancake Produced by the canon and immediately receiving numerous positive opinions and a great positive response at the sales level. It is characterized by an attack ef , therefore perfectly compatible with all the DSLR type cameras of the series EOS . In particular, the Canon EF 40mm f/2.8 STM lens has a maximum opening of f/2.8 and is also equipped with a stam engine (also called Passo-Passo ) and a focus that requires a minimum distance of about 30 centimeters as well as a maximum enlargement system equal to 0.18x . Compared to other lenses produced by the same Japanese company, the Canon EF 40mm f/2.8 STM is not equipped with an automatic image stabilizer, an ultrasonic engine but has a AF motor (the steppe motor) and of a dedicated macro mode. One of its many qualities is its extremely light and versatile being (it weighs only 170 grams ) which therefore makes it usable in any circumstance from professional photographers who seek maximum efficiency and quality, but also by amateur photographers However, they do not give up taking photos of the highest quality.