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The Canon EF 1. The 1. Here is an example of the focal length increase provided by the 1. The difference in framing angle of view is quite noticeable between the three examples shown. This is the lone, but significant, advantage provided by extenders. Use of a 1. The lens aperture still opens to the same physical diameter, but the ratio of the aperture opening to the focal length is reduced — by 1 stop. Factor in the focal length multiplier and max aperture reduction to get your resulting lens equivalent. For example, a 1. And, as shown in my Canon EF 1. DSLR cameras will continue to calculate auto exposures properly when used with Canon extenders. The lens and extender combo can always be used in manual focus mode, but remember that a narrow max aperture creates a dark viewfinder that makes manual focusing difficult. Add the Canon EF 1. Shooting with the Canon EF 1. When Extender EF 1. This is due to improvements in AF precision made possible by the new microcomputer in the extenders. In the Canon EOS system, this is done by deliberately reducing drive speed when an extender is detected. Before you immediately conclude that this is a problem, understand that this reduction in drive speed now corresponds to the effective speed you would achieve with the same EF lens alone. The biggest downside to using an extender, in my opinion, is the image quality reduction it causes. Because the Canon EF 1.