I’d forgotten how much fun Cokin Creative Filters can be. You remember Cokin—slotted plastic filter holder that attaches to many dissimilar lenses via inexpensive adapters, and square filters made of CR39 acrylic resin. The idea that is you can use the same set-up on just about every lens you own, even if they have different size filter threads. And because most of the filters are square, you can slide them up and down in the holder to adjust the effect. The few round filters can easily be rotated for the same reason.