Set the focus preset switch to ON or . Press the shutter button halfway or turn the focusing ring to focus the distance you want to preset. Press the focus preset button. The focused distance will be preset. If the focus preset switch was set to , the beeper will sound once. By turning the playback ring to the left or right, the focus shifts as has a silent focus motor built into the lens. Canon EF 500mm F/4L IS II USM. Sigma 800mm F/5.6 EX APO DG HSM. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance. Canon EF 500mm f/4L is II USM Lens . Visit the Canon Store. 3.8 3.8 out of 5 stars 17 ratings | 19 answered questions . $8,995.00 $ 8,995. 00. FREE Returns . Covering a variety of telephoto focal lengths, the Canon RF 100-500mm f/4.5-7.1 L IS USM spans a short- to super-telephoto range within a sleek and portable form factor. . The modest maximum aperture enables a relatively portable design that is well-suited to handheld, walkaround use and optical image stabilization also helps to steady photos and videos by up to five stops when working in It's actually lighter than Canon's EF 600mm f/4L IS lens, weighing just under 10 lbs. It uses a refined optical design, with two fluorite lens elements, one UD element, and one Super-UD-glass element, for outstanding correction of color fringing and superb contrast and sharpness. 0Z5q1MZ.