A stepping ring is typically used to convert an accessory thread on a lens to a different size, enabling the attachment of items with a larger or smaller thread size. A step-up ring is used to increase the thread size, while a step-down ring decreases it.
When selecting a stepping ring, you should ensure that the first number is the diameter you wish to step from (i.e. the lens diameter), and the second number is the diameter of the accessory or filter that needs to be attached.
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