This filter is properly discharging its role in lessening or removing glare and get more saturated colors, such as blue skies more. Like all polarized, it is micro embossed and therefore fragile. Avoid wiping or putting your fingers on its surface. He lost about a diaphragm and a half in brightness, which is not really a problem as its current use is outdoors in bright or sunny weather. It does not affect the sharpness of the lens. With Sigma 18-50 f2.8-4.5 lens, although this filter is thin (slim!), I can screw it securely. I can also mount it with visor, but it becomes difficult to turn without putting your fingers on it and without disturbing aiming.
