No more rain drops on your lens - The Tokina Hydrophilic water dispersion filter reviewed - Newsshooter
Mika McKinnon on Twitter: "Optics of raindrop-lenses: The rain is a flat-backed convex lens. The lens redirects light ray paths to invert what you see. Ignored: How the glass slightly refracts (bends)
Raindrops on a Grass Stem | Jon Klein Wildlife and Nature Photography | Jon Klein