Bemused on this, what is this?

Started Nov 30, 2012 | Questions thread
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macgrady
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Bemused on this, what is this?
Nov 30, 2012

What is this? I am still confused about its function after reading descriptions three times. It is a 15mm Rod Support V-wheel DSLR Follow Focus, which copied from web title.

I need someone to answer this question as detailed as possible, thank you!

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agaiin is a gain..

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