The Kase Wolverine Magnetic Circular Filters Kit is an easy-to-use neutral density filter system that relies on magnetic attraction to hold the filters on a camera lens.
It’s available in a range of sizes so you can buy one to suit your lenses. As a rule, buy the biggest size you might need and then buy step-up rings so that it can be used on your smaller lenses as well as the larger ones.
The supplied magnetic adapter screws on to the end of a lens to enable the filters to be snapped on and off in a flash.