Reference: 90431446
Lens diameter 49mm - filter diameter 46mm.
Used to mount filters or pre-filters on lenses if the filter dimension is different than the lens dimension.
Reducing rings (also called step up or step down) are used to attach filters or pre-filters to lenses when the filter dimension is different from the lens dimension. Thus, they allow you to use one filter/pre-adjustment on multiple lenses. The first is the lens dimension, the second the filter dimension in mm.
Data sheet
Specific References
Reference: 90431446
Reference: 90431700
Reference: 90431723
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Reference: 90431722
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Reference: 90431496
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Reference: 90431448