What does EF lenses Canon?

(Canon EF 50mm f/1.8 II Camera Lens) and (Canon – Lens – 50 mm – F/1.8 II – Canon EF) The two lenses, i found on Amazon, what are the differences between them? Does the EF make a difference? They are also good for my Canon 50D? Thank you very much.

"EF" is just a brand name, including the Chrysler Cordoba. What does "Cordoba" mean? Well, that does not mean nothing. It's just the name of its product lines. (Corinthian leather!) (Okay, okay.'s Official response is that Canon "EF" means "electrofocus" but most people do not make the connection, and it does not matter.) All Canon lenses made since 1987 is nicknamed EF, with the exception of the change of inclination the lens (since no autofocus), and the new EF-S lenses designed for crop digital sensors such as the 50D. All these lenses have no on the camera. But wait, there's more! Canon bayonet mount is casually known as "EF mount." The assembly is the metal ring on the camera between the lens and the sensor. Obviously, if a goal was not designed to accommodate a metal ring that will not stick and you will not be able to take pictures with him. Sigma, Tamron, Tokina, Carl Zeiss and other third-party lenses that are compatible with the EF mount, but as "EF" is a trademark, these lenses have no "EF" in front of their names. Generally, work, precisely the same as one of the regular lens Canon EF and often cost less. The goal we are talking about is the Canon EF 50mm f/1.8 Mark II. That was written in two different ways. It's the same goal. In my experience, makes a good portrait lens on a crop body, but an equivalent focal length of 80 mm, is probably too long for general photography. Hope this helps!

The difference (FOV) between the full frame(Canon 5DMII) and crop sensors(Canon 7D)