Athabasca Blade filters are an innovative system of filters that bring new and exciting technologies to the world of 100mm Glass filters. The Blade system is based around the A3 100mm Aluminium filter holder. The A3 filter holder includes a removable Circular Polariser with a clever adjustment wheel. Blade filters are unique because they offer a 40% lighter and thinner form factor. This is achieved by using high quality tempered glass. Thin tempered glass give these filters more strength, more resistance to breakage if dropped, and less weight to carry. The Athabasca Blade system is a revolution in handling, quality, robustness and longevity. Blade is the smarter choice.