While its optical design is carried over from the previous-generation model, the new-generation lens features Sony's proprietary Nano AR Coating on optical surfaces.
With the addition of a reinforced, glass lens cover, the EX-G1 is tooled with a multi coating that is water-repellent and prevents light reflection from ruining pictures.
Additionally, to thoroughly eliminate ghosting and lens flares, reflectivity was kept to half of the previous value at a wavelength of 450 to 650 nm, thanks to the lens surface treated with the Olympus-original ZERO (ZUIKO Extra-low Reflection Optical) coating.