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The Massa step-down ring is a metal adapter for attaching filters, lens caps and converters to lenses or tubes with a 43 mm thread. It allows you to use accessories with a 37 mm thread, and its design prevents vignetting.
It is made of aluminium with a protective coating and has a black finish. The coating protects the thread during repeated screwing and unscrewing.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.