 Doug Vann |
Canon 75-300 USM Lens I bought a 75-300 USM lens to go along with the standard lens I got on my Elan 7. It says when the lens is set to auto focus do not turn the focus ring manually. My question is this - does it do damage if you move the focus ring when in auto focus? The lens works fine so I am just trying to avoid any future problems.
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Jon Close |
Yes, it can do damage. There are reduction gears (probably plastic) between the focus ring and the motor. If you try to move the focus ring without first disengaging these gears with the AF/M switch, you'll risk chipping a gear tooth or breaking a gear.
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