The Canon EF 1.4x II is a multiplier for format ff and aps-c and was produced until 2011, so currently it is located outside production. The Canon EF 1.4x II is ideal for journalistic, sports and naturalistic photos. This extender significantly increases the focal length of the telephoto and lenses of the canon series and is particularly appreciated for automatic focus, characterized by an optimized precision. The model presents a better communication between the camera and the lens compared to other similar products and this guarantees an image quality without compromise. The key points of this model concern: an extension of the focal length of the lens of 1.4x; An exceptional image quality and a high resistance to dust and water. The product is characterized by an optimized lens coating and there is an improvement in communication between the lens itself and the camera. Finally, another point in favor is compatibility with numerous series. The specific technical characteristics instead concern the presence of 5 elements in 4 groups, tropicalization and size equal to 73 x 27 mm. As can be well ascertained about an exceptional extender, with a cost contained with respect to the new generation and it is for this reason that it is still purchased. It is pockety, complete with all useful seals to ensure ad hoc protection against the weather. It is also perfectly compatible with the latest lenses models, but also with the older ones. This guarantees the possibility of being able to use the extender by opting for a high choice of lenses, different from each other, also in terms of cost. Precisely in reference to compatibility, it is interesting to know that the lens is compatible with the reflex fullframe and aps-c Canon EF .