CDLC Explains How to Use Focus Preset With Super Telephoto Lenses

From the Canon Digital Learning Center:

"Most Canon super telephoto lenses have a cool feature called Focus Preset, which allows for quick focusing to a predetermined distance. It is an ideal tool when shooting sports or wildlife, where you might be rapidly changing focus from two vastly different distances. At a basketball game, for example, you can preset the focus on a basketball rim. Then, follow-focus the action using AI Servo AF mode via either the shutter button or the back button. When the action shifts to under or around the rim you’ve preset focus on, a slight twist of the serrated Focus Preset Ring brings that preset distance immediately into focus. The ring, located just in front of the manual focus ring, falls readily to my hand, whether I am hand-holding the lens or shooting from a monopod."

• EF 200mm f/2.0L IS
• EF 200-400mm f/4L IS Extender 1.4x
• EF 300mm f/2.8L IS II
• EF 400mm f/2.8L IS II
• EF 400mm f/4 DO IS II
• EF 500mm f/4L IS II
• EF 600mm f/4L IS II
• EF 800mm f/5.6L IS

See the entire article on the Canon Digital Learning Center.