Tripod Mount Ring C
My own personal experience is that after trying ebay twice and never receiving the tripod ring I finally gave up and placed an order at B&H and finally received the backorder 8 months later. Thre Canon product is great in every respect and much better made/quality that the ebay/Hong Kong units that I have seen. Having said all that I am not certain that the ring is absoutely necessary for 70-300L lens.
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