Nikon F-mount reverse ring for close-up photography. In reasonably good condition. Instant purchase OK, no price negotiation. A ring that attaches a 52mm filter thread lens to the body in reverse, either via a bellows attachment or directly. ● When shooting at magnifications of 1:1 or greater, reversing the lens provides higher performance. ● BR-2A is for lenses with a 52mm filter thread, and BR-5 is for lenses with a 62mm filter thread (used with BR-2A). ※ Cannot be used with G, E type lenses, or PC lenses.