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Focus limiter switch

Started Apr 13, 2010 | Discussions thread
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JohnK
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Focus limiter switch
Apr 13, 2010

Hi everyone, I have a new (to me) Sigma 50mm/f2.8 lens. On the lens barrel is a "focus limiter switch" The instruction sheet sort of assumes you already know what this feature is for, so does not explain it much. What is focus limiting, what are its benefits, when should it be used, when should it not be used? Any info about this would be appreciated.
Thanks,
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JohnK
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