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The Genus Universal Donut "Nun's Knickers" Adapter Ring is an adjustable, step-down adapter ring with an outside diameter of 105mm. The adapter is designed for use with lenses with a front side diameter of 75mm or larger. Once fitted, light cannot enter from the sides of the attachment.
In the Box
Genustech GARD-NK Universal Donut "Nun's Knickers" Adapter Ring
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Outside Diameter: 105 mm
Inside Diameter: minimum 72 mm (stretches to fit larger diameters)