The BR-2A enables you to mount a 52mm front thread lens in reverse on the PB-6 and Nikon cameras
Provides a 52mm thread for filters and other lens attachments with lens in reverse
Allows mounting lens with 62mm thread (use with BR-2A)
Attaches to rear of Nikon lens when threaded onto close-up bellows. Other end accepts 52mm filters Item Specifications: Product Description: Nikon BR-3 - adapter ring Product Type: Adapter ring