What is a lens collar, please explain

Started Mar 24, 2013 | Discussions thread
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HerbertA
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What is a lens collar, please explain
Mar 24, 2013

Hello Everyone,

What is the purpose of a tripod lens collar?  I have seen pictures of them, but I do not understand what it is used for and to what it gets attached after affixing it to the lens.

Would I need one if I had either the Canon 70-200 f4 L USM or the Canon 70-300 f4-5.6 IS USM?

Thank you.

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