Reference: 90431689
Lens diameter 37mm - filter diameter 30mm.
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: 90431689
Reference: 90431715
Reference: 90431730
Reference: 90431721
Reference: 90431491
Reference: 90431446
Reference: 90431694
Reference: 90431606
Reference: 90431739
Reference: 90431706
Reference: 90431609
Reference: 90431693
Reference: 90431454
Reference: 90431738
Reference: 90431605
Reference: 90431686