EOS Distance Limiter Switch

[Scott Huguley]

Specifications for the EF 100mm f/2.8 USM Macro lens list a "Distance
Limiter Switch" that , I assume, allows the user to select between the
available options of 0.31m ~ Infinity; and 0.48m ~ Infinity.

What is the purpose of this switch?  What is the advantage of allowing the
user this flexibility?

Thanks.

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