Making cameras lighter is a function of several things, including new and lighter materials for what makes them heavy. Lenses are high on this list and this week Chris and Adrian take a look at Aluminium Oxynitride, also known as ALON™ or transparent aluminium. With its higher refractive index and its mechanical strength, is it on the way to replace traditional glass with a thinner and lighter scratch-proof alternative? According to a rumor from 2018, at least Zeiss might be looking into it.