When photographing your hummers, you will find that they are quick and that your automatic focus can not keep up. It is then that you will find the construction of a perch very handy. These mini feeders come with a red plastic covered wire that you can use to hang your feeder or bend it to construct a perch for your hummers to land on. Your hummers do not have to land to feed. This is for your benefit more than their's.
Having a perch will allow you to set your camera to manual focus and pre-focus to the perch area. Then just wait for your hummer to land and snap away to your heart's content.