All the main advantages and disadvantages have already been described bycomlleagues, so I’ll tell you about what, for some reason, no one has. If you plan on taking pictures with a bright light source in the frame (such as an electric light bulb), you will most likely not like this lens. Because catch a full box of hares. Example: All shots showing powerful hares were taken with this lens. The rest are 21 and 85 of the same manufacturer. Even the cheap Canon 50/1.8 does better in this regard. The rest of the lens is very good, but one single drawback crosses out all the advantages if you like to shoot in backlight.