Heliopan 67mm Linear Polarizer Filter

A 67mm Linear Polarizer Filter is a crucial tool for both professional and amateur photographers, designed to enhance the quality of both color and black and white images. This filter is color neutral, meaning it doesn't alter the original colors in your photographs. Instead, it works to increase the contrast and color saturation, offering you more creative control over your images.

Natural light, particularly sunlight, is polarized and has a high color purity. However, as it passes through the atmosphere, part of it scatters, resulting in a grayish haze over all colors. This 67mm Linear Polarizer Filter effectively reduces or eliminates this effect, ensuring your images are clear and vibrant.

The filter is particularly useful when light falls at an angle of approximately 35 degrees onto a reflective surface such as water, glass, or plastic. By using this polarizing filter, unwanted reflections are absorbed, allowing the true colors to reach the film. This results in water surfaces appearing transparent and clouds appearing more saturated.

The light loss of a polarizing filter varies between 1 and 1.5 F stops, which can be manually or automatically corrected depending on your camera type. This 67mm Linear Polarizer Filter is constructed with a neutral color foil cemented between two plane parallel glass discs. The foil is designed so that light rays can only pass in one plane, enhancing the overall image quality.

The polarizing filter is mounted in a calibrated rotating ring, allowing you to easily set the desired position and effect. With an SLR, you can see the result in the finder, while with viewfinder type cameras, you simply hold the polarizer in front of your eye and turn it to see the desired effect.

This 67mm Linear Polarizer Filter is also equipped with a calibrated rim, making it easy to set the filter to the same position on the lens. If no effect is visible, the available light conditions cannot be polarized, and its use is not advisable.

There are two types of polarizers: linear and circular. This product is a linear polarizer, which is ideal for camera systems where the built-in light measuring system uses light that has passed through the mirror via a beam splitter. However, it's important to note that using linear polarizing filters can cause incorrect focusing measurements.

To avoid this, the circular polarizer has a second component, a 1/4 wave plate in its construction. The polarized light is set in rotation by this plate and can pass without interruption through the measuring system, providing accurate measurements. Circular polarizers are also recommended with the auto-focus lenses in video cameras.

Lastly, to ensure the longevity of your 67mm Linear Polarizer Filter, it's recommended to avoid overheating. This filter is a valuable addition to your photography equipment, designed to enhance your images and give you more creative control.