General Brand 49mm to Nikon F Reversing Adapter AV49N B&H Photo
Reverse Adapters
Price history & Review on Camera Reverse Adapter Ring for Canon 58mm Macro Reverse lens Adapter Ring for Canon EOS EF Mount 550d 650d 450d 700d 1000d | AliExpress Seller - ikacha
Reverse Adapter Canon RF-Mount
Macro Reverse Ring for Nikon - Camera Mount to Filter Thread Adapter f – Fotodiox, Inc. USA
55mm Macro Lens Reverse Adapter Ring for Nikon AI AF Mount D7500 D7200 D5600 D5300 D3400 D3300 D850 D750 and AF P 18 55mm lens|reverse adapter ring|adapter ringring for nikon - AliExpress
Macro Reverse Ring for Micro Four Thirds - Camera Mount to Filter Thre – Fotodiox, Inc. USA