Canon 100-400mm f4.5-5.6l is usm lens operation question

Started Aug 8, 2012 | Discussions thread
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Timmie Regular Member • Posts: 170
Re: Canon 100-400mm f4.5-5.6l is usm lens operation question

The switch sets the minimum focus distance. Auto focus using the entire range can be slow so you can use this switch to limit focus range. You would only set it to the shorter distance if you expect to focus on something close.

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