As ones' lens 'collection' grows, you'll find that no matter what, you'll need different size screw in filters. At one point, I needed 5 different size filters if I wanted to fit each of my 7 lenses. Bulky to carry and devastating to the wallet. So, before I went off the deep end buying filters, I decided to go with one or more 'step up' rings and buy only the largest size filters.
But these days, I have 4 lenses, and, of course, 4 different filter sizes needed! Surprise, surprise! But I decided to 'cheap out' and only buy 77mm filters and step up the 67mm and 72mm sizes. For the 82mm filter size EF 16-35 f2.8L ii...I just have to avoid putting filters on that one. But if I decide to get a GND...I'll go with the larger size square filter and various mount adapter sizes.
The only negative to 'stepping up' and using larger filters is that the lens hood either has to be put on before putting on the stepped up filters, or, the hood won't fit at all. When that happens, I've resorted to using my left hand as a 'hood' (having a handstrap on the camera works wonders). Some have suggested a taped on note card will work, too. All I have to do is remember to bring the card and tape!
