I’ve got a lot of Canon gear, but only one L-series lens of my very own, and that’s also the only one that features a rubber gasket where the lens mounts to the body to keep out dust and moisture. It’s a shame that it isn’t included in any other lenses, because it’s an inexpensive component and one that can really help prolong the life of your body and lens. That’s why a new Kickstarter project called Dust Donut is such a great idea.