Nikon BR2A BR-2A Macro Reversing Adapter Ring for 52mm Thread Lens New | eBay
Nikon BR Bellows & Macro Accessories
Nikon BR-2A Lens Reversing Ring 2657 B&H Photo Video
NIKON BR-2A Macro Adapter Ring 52mm | eBay
Nikon BR-2 Macro Adapter Ring – Kamerastore
JJC RR-2A (Similar as Nikon BR-2A) Reverse Mounting Adapter (52mm Front Thread) for Nikon F Mount Camera - Extension Tubes & Lens Adapters - ShaShinKi
EMULSIVE on X: "Hell to the F-YEAH! Nikon reverse mount macro ring for the win 👍 Furthest focus distance ~10cm with the Nikkor 50/1.2 AI-S. https://t.co/bQ0cXbMwVJ" / X