Linear polarizers are used with most manual focus SLR and
rangefinder cameras to increase color saturation and reduce
reflections. The neutral gray color and plane parallel polarizer
material guarantee optimal image results. High-quality optical
glass ensures excellent pictorial quality. The filter factor varies
according to how the filter is positioned in relation to the sun.
Filter factor is between 2.3 and 2.8.
B+W polarizers have a foil, which consists of a grid construction,
cemented between two pieces of glass. This grid construction is
invisible to the eye, and it only allows light rays vibrating
parallel to the foil grid to pass through. Light rays which are
vibrating perpendicularly to the foil grid are totally blocked,
while other directions are partially suppressed.
When light is reflected from a surface, a polarization of the
reflected light develops. The degree of polarization depends on the
angle of incidence of the light, which varies according to the
characteristics of the material. Light reflecting off water
surfaces has a maximum polarization of under 37 degrees, while
reflection off glass is under 32 degrees. With the aid of a
correctly positioned polarizer, reflections can be totally
eliminated under ideal conditions. This occurs when the
illumination angle and picture taking angle are almost equal and
the angle of maximum polarization is in the range of 30 - 40
degrees. The effect of B+W polarizers can be observed through the
viewfinder while rotating the front element of the polarizer.
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