Sensei 77-67mm Step-Down Ring

This ring does exactly what you expect. It allows you to use a 67mm filter on a 77mm lens. The major downside to this setup is that with a 10mm different, you will definitely block some of the image at wide focal lengths. I like to leave a slim protection filter on my lens at all times. If you use this after that filter, you will see it block the image out to around 70mm which is substantial. If you attach this directly to the lens, then you have a lot more room to work with.Overall, this is a well made, sturdy adapter and perfect if you have some expensive 67mm filters and don't want to buy 77mm equivalents.