Following on from G30 BI, Slate, here's the latest. A Dark Grey custom cut from a Crosshair 2012 donor. Dark Grey is another unglamourous lens that doesn't seem to get a lot of love. I like the green tint which reminds me of how a Rayban G15 looks, though perhaps a shade more subtle. At 10% transmission, it's a great alternative to the original BI lens, especially if you want a change from iridium.