Step Up Rings

Say Goodbye to Step Up Rings – Alter Rapid Filter System Takes an Old Trick and Makes Something New
David Crewe
The Rapid Filter System (RFS) lets you engage and disengage lens filters the moment you need them. It attaches via the universal filter threads your lens has, and then you can screw a ND or CPL filter on to it.

Holiday Wishlist | Top 5 Accessories For Your Sony A6500, A6300, & A6000
Wendell Weithers
Some of the best cameras around for the money, and with a few things they can be even better

One Purchase that Can Save You Hundreds of Dollars on Lens Filters
Anthony Thurston
Lens filters are expensive, or atleast they are when you buy quality filters. The problem with lens filters in my opinion has always been that you will no doubt own many lenses with many different sizes of filter rings.