Cokin Z-Pro Series Filter Holder Adapter Ring (52mm) – Pro Camera Hawaii
Cokin "A" Series 52mm Adapter Ring (A258) CA452 B&H Photo Video
Tilta 52mm Adapter Ring for Mini Clamp-On Matte Box MB-T15-52
BR-3 Mount Adapter Ring for 52mm Thread | Nikon
Amazon.com : (2 Pcs) 52-55MM Step-Up Ring Adapter, 52mm to 55mm Step Up Filter Ring, 52mm Male 55mm Female Stepping Up Ring for DSLR Camera Lens and ND UV CPL Infrared Filters :
Fotodiox Step Up Filter Adapter Ring for Hasselblad Bayonet, Anodized – Fotodiox, Inc. USA
Cokin P Series Filter Holder Adapter Ring (52mm) CP452 B&H Photo