I did more checking with the 44mm stepup ring. It did not work with my Ednalite adapters. Too small for a thread match. It worked fine with several Kodak adapters and a Tiffen series step ring. A couple Kodak Series VI hoods worked on the Ednalite but a Tiffen hood did not. It was too loose. As I have heard in the past not all makers Series VI (or other series) items work perfectly with other makers.