Variable neutral density (ND) filters are handy tools for photographers, in that their opacity can be adjusted simply by ...

And while Luxottica has nothing to worry about yet, he did manage to get some clearly if subtly photochromic samples, despite the challenges.

The answer is a photochromic lens and ekoï have taken it a step further with their E-LENS Electronic glasses. I like photochromic glasses, my ‘normal’ every-day glasses are photochromic and I’ve ...