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A step-up ring connects two different filter thread sizes, from smaller to larger. It bridges two different filter thread sizes by having each dimension on each end. It's a ring that you screw onto your smaller lense filter thread size so that you can attach larger filter on the larger end. For example, a 67-77mm step up ring would connect to a lens with a 67mm filter thread size, and expose a 77mm filter thread to the outside so you could attach an Outex 77mm front glass port.

Keep in mind that as explained in our Questions/FAQ page menu, by adding physical distance between the lens and the Outex port, you may introduce vignetting into the image by using step up rings. So while it's a "cheat" way of using the same Outex port with multiple/different lenses, you can eliminate vignetting by using the correct matching Outex port filter thread size that matches the lens filter thread size.


be sure to check out our FAQ's page for similar topics