Polarizing Filters reduce reflections and glare, they are a neutral color and can be used for color or black and white imaging. As the light coming from the sun is not polarized parts of the light become partially polarized due to the scattering of particles in the atmosphere. This scattering reduces the transparency of the air and creates haze in the distance and the blue in the sky on a sunny day. Polarization also controls the reflections of light and preserves color and texture of the surface. The Heliopan Polarizer improves the color of the sky, (in distant pictures, mountain scenes, etc.) it reduces the bluish cast in landscapes and increases the blue color of the sky. The effect is strongest at a 90° angle to the sun. In addition polarizers enhance the color saturation of the scene by suppressing the reflections on the surface, undesired reflections are largely eliminated. While increasing color saturation with software can also improve the color saturation the
faded parts of the leaves in the illustration above will increase as well. This procedure will not replace the need for a polarizer. For digicams we recommend using a circular polarizer, linear polarizers may result in incorrect exposure or focus under some lighting conditions.
They are available with or without SHPMC coating and in slim or standard rims. The rims are calibrated to help in finding the
proper settings when a TTL preview is not available. If it is not possible to view through the lens the desired effect is obtained by rotating the filter in front of the eye and nothing the numbered scale when the desired effect is obtained. Mount the filter on the lens and rotate the filter until the number is in the same position on the lens as it was when viewed when in front of the eye. The polarizer can almost totally eliminate reflections yet it is variable in its effect and should be used according to individual desires. Exposure factor: 3.0 – 4.0 x
HELIOPAN has the following polarizers in its program:
– Linear Polarizer
– Linerar SH-PMC Polarizer
– Circular Polarizer
– Circular SH-PMC Polarizer
– High Transmission Circular Polarizer
– High Transmission SH-PMC Polarizer
Available in regular version with front thread and in slim-version without front-thread.
High Transmission Circular Polfilter
The HT (High Transmission) Polarizer is a circular polarizer. It has the advantage that the light loss is only 1 stop. 1 stop = 2x exposure factor.