Unless they've changed now, the Chameleon used to go considerably darker but nit a slight as the Zebra (I have both). The Zebras are ok for brief trips over snow, but I didn't find them enough for all day on snow or glacier travel.
I've found the Julbo lenses much better than cheaper photochromic glasses, but the Smith IOS/IO photochromic lens is very similar to the Julbo zebra, with a similar price tag.
Fri Night Vid Finding Focus - Life Behind The Lens of a Climbing Photographer
This week's Friday Night Video is a portrait of a prolific climbing photographer from Wedge Climbing. Sam Pratt is well known in both the outdoor and competition scene but if you haven't heard of him, you've likely seen...