Hasta La Ideas

Neutral density (ND) filters are used by photographers to stop down the amount of light entering the camera lens. The filter is actually two layers that are polarized; rotate the outermost one, and the admitted light is reduced or increased.

A startup called Lombell figured it would be a good idea to put this arrangement into a pair of sunglasses:

While I can appreciate that this must’ve sounded like a cool idea, wouldn’t the UX suffer, since each lens needs to be adjusted independently? I’ve never tried these, but unless your eye can easily detect between F-stops, I’d guess you have to take the glasses off as you dialed them to ensure symmetry.

If this is you, these are $90.