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A simple concept. For example, you have a filter or other lens accessory which screws into a 55mm thread, butyour lens is a 52mm thread. These rings provide afemale thread adapts your accessory, and a male thread which screws into your lens. Allows you to mix filters and other accessories on various lenseswhich may have different size accessory threaded sizes. Available in many different sizes (Sizes are in millimeters). First number is the lens size; the second is the filter size.
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