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67-77mm Step Down Ring
Filter adapter
Step Down Rings are a reliable and economical way to use filters. It lets photographers with multiple lenses and different filter threads buy fewer filters, and still use their lenses how they want to.
A 67-77mm step down ring allows you to use a 67mm filter on a 77mm lens.
Note: Using step-down rings with full-frame cameras can result in vignetting, and generally better results will be obtained with 'stepping-up'. An exeption to this is if you are using lenses and filters designed for larger-format cameras (i.e. full-frame) on smaller-format cameras (i.e. APS-C and Micro Four Thirds). In these cases the smaller image field will often negate any vignetting or image clipping.