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

Started Aug 8, 2012 | Discussions thread
Timmie
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Re: Canon 100-400mm f4.5-5.6l is usm lens operation question
In reply to planenut, Aug 8, 2012

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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