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The Nikon BR-3 is a specialized mount adapter ring designed for macro photography. Its primary purpose is to provide a 52mm filter thread on the rear of a lens that has been reverse-mounted using a reversing ring like the Nikon BR-2A.
Key Functions:
Filter & Hood Attachment: Converts the lens’s rear bayonet mount into a 52mm screw thread, allowing you to use standard filters (UV, ND, polarizing) or lens hoods while the lens is reversed.
Lens Protection: Acts as a physical buffer for the exposed rear element and internal mechanisms of a reversed lens, helping to prevent damage from dust or accidental contact.
Bellows Integration: Frequently used with bellows focusing attachments (such as the PB-6) to enable precise close-up work.
Technical Specifications:
Mount Type: Female Nikon F-mount (bayonet) on one side; 52mm female screw thread on the other.
Compatibility: Works with any Nikon F-mount lens that is being used in a reversed position.
Construction: Typically features a durable metal ring (brass or aluminum) with a plastic filter-thread insert.
