Nikon BR-3 adapter ring. format_110 8 MC lens for the

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Nikon BR-3 adapter ring. format_110 8 MC lens for theNikon BR 3 adapter ring. Nominally for Bellows Focusing Attachment 2, this ring complements the BR 2 reversing ring (not included) by mounting to the end of a reversed lens and providing a standard 52mm thread for filter or accessory mounting. In excellent condition.