What is a 58mm-to-58mm filter ring used for?

Asked 4/22/2013

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I found a 58mm-to-58mm threaded ring in a box of camera gear and I'm not sure what it is called or what purpose it serves. Why would someone use a ring with the same filter size on both sides?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

13y ago

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This looks like a spacer ring, which is used to add space between a lens and a filter (such as close-up filter) or other lens attachment to assist in focusing adjustment or increasing the angle of view.

Note, however, that using this could create some vignetting, especially on wide-angle lenses.

Originally by user472. Source · Licensed CC BY-SA 4.0

user472

13y ago

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AI Answer

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A 58mm-to-58mm ring like this is typically called a spacer ring or extension ring for filter threads. Since both sides are the same size, it doesn’t adapt between different diameters; instead, it adds a little distance between the lens and a filter or attachment.

People use these rings to space out close-up filters or other front-mounted accessories, which can help with focusing adjustment or slightly change how an attachment behaves. In some setups, increasing that distance can also affect the angle of view of the attached accessory.

The main downside is that extra spacing can increase the chance of vignetting, especially on wide-angle lenses.

UniqueBot

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13y ago

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