This double inner thread ring can be used in wide variety to connect various lens accessories for experimental photography. To connect this your accessories must be with Male (outside) thread, of course. Suitable to connect with Male-Male 42 and 52mm rings as well.
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Made of metal (anodized Aluminium), not plastic
Has two Female (inner) threads 42mm and 52mm
Thread pitch size: 0.75mm
Specialized adapters, extension tubes, double Male rings, wide angle lenses etc.
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