46mm to 37mm step-down ring + 37mm rubber lens hood (minus the rubber lens hood) In pictures: Bare lens: {} Plus 46mm-37mm step-down ring: {} Plus 37mm rubber-lens-hood-minus-the-rubber-lens-hood: {} Plus 37mm lens cap: {} This lens hood setup was inspired by this blog post. I swap this lens hood onto my Panasonic 20mm when I use my GH2. PS: Just found out a minute ago that the blogger configured a similar lens hood for his m43-mount Sigma 30mm.
