What does Canon ef mean?

Canon EF is a lens aperture specification of Canon Company. The full name of EF is Electro-Focus, which means electronic focusing. Canon EF imports Canon's EF lens caliber standard, which is relatively large and meets the needs of some photographers. The lens has large aperture, high precision and excellent image quality, which is perfectly suitable for all kinds of cameras under Canon.

Usually, we novices often waste money because we don't know the EF aperture specification, but after learning the EF aperture specification, we can know the difference of EF and what we need to pay attention to when choosing EF lens, so as to better improve our shooting skills.

Canon EF is an invention of Canon Company. In its system, EF lens is a relatively standard lens aperture specification. Canon EF has adopted different designs for Canon's various cameras. For example, mainstream flagship cameras such as 5D MarkII, 1Ds MarkIII. Adopt higher specifications, and at the same time, in the fluorine-coated I series lens, we also pursue the sealing design of the mirror body.

Therefore, in the process of lens production, Canon EF always has a strong market competitiveness, which can achieve better performance in lens shooting accuracy and clarity, and improve the shooting environment for the majority of photographers.

Canon EF is outstanding in the cooperative work of sensor and lens, and can achieve near-perfect cooperation. EF focuses on the improvement of shooting quality, so EF lens design has high precision and excellent depth of field effect.

The cooperation mechanism of Canon EF enables the lens to focus quickly and accurately, thus providing unprecedented high-quality and high-definition images for specific shooting environments such as sports and news. At the same time, EF also makes Canon cameras a good shooting equipment, leading a brand-new shooting technology trend in the industry.