Central sharpness is very good at f/1.8 and f/2, excellent from f/2.8 through ... The taller the column, the better the lens performance. CA (Chromatic Aberration) is measured with any in-camera ...

Canon has been making cameras for professionals and hobbyists for a very long time, and the EF lens mount ... the 18-50mm offers a 29-80 focal length equivalent, and a constant f/2.8 maximum ...