1. EF stands for "electronic focus" - This is the main meaning of the acronym EF. It refers to the autofocus system used by Canon in their lenses.
2. EF lenses are designed specifically for Canon cameras - The EF system was developed by Canon for use with their own cameras. This means that EF lenses will only fit on Canon bodies.
3. EF lenses come in different versions - there are standard, zoom, and specialty lenses available in the EF line of lenses. Each lens is designed for a specific purpose.
4. EF lenses have different maximum apertures - The maximum aperture of an EF lens refers to the largest opening through which light can enter the lens. This affects the lens's ability to take in light and its performance in low light situations.
5. EF lenses are compatible with EOS cameras - Canon's EOS camera series is designed specifically to work with EF lenses. When using an EF lens on an EOS camera, the autofocus system will be activated, providing fast and accurate focus.
6. EF-S lenses are not the same as EF lenses - While EF-S lenses are designed for Canon cameras, they are not interchangeable with EF lenses. EF-S lenses are designed specifically for APS-C sensor cameras while EF lenses are full-frame lenses.
7. EF lenses are known for their quality - Canon's EF lenses are generally regarded as some of the best in the industry. They are known for their sharpness, clarity, and color reproduction, making them a favorite among professional photographers.
