How to Manually Focus Your Canon EOS 6D - dummies When you can’t achieve focus, you have no choice but to manually focus the lens. Canon lenses and most third-party lenses give you the option of switching to manual focus. To manually focus the lens, follow these steps: Move the Focus switch to MF. On most lenses, you’ll find this switch on the left side when the camera is facing your subject. 12 Best Lenses for Canon 6D // (2021 Ultimate Buyer's Guide) Photographed with Canon EF 50mm f/1.4 USM. 12 Best Lenses for Canon 6D. I’ve listed out each lens here so it is easy for you to see them from a high-level view. Click/tap on each lens name to jump to that section. At the end of each lens section, there is a link to jump back to this table to make it easy for you!. Because I am a published photographer myself, I have had the opportunity to Canon EOS lens Adapters - Using Manual focus lenses on Using Manual Focus Lenses on Canon EOS bodies. Left:Bower fisheye manual focus Center: Vivitar 85/1.4 manual focus Right: Zeiss 21/2.8 manual focus. A common question from Canon EOS owners is whether older manual focus lenses from other manufacturers can be used with a Canon EOS body. The answer is a qualified "yes" in many cases.