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Old 27th May 2019
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Graham_of_Rainham Graham_of_Rainham is offline
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Re: 300mm F4 Tripod Mount Screw Hole question

I believe it is for an anti rotation pin that is a throw back to when big cameras were carried on tripods and they could come loose. Also to stop rotation on the tripod with rapid panning.

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BDennis (27th May 2019)