Model BF 5x5-HMHDMD64 / BF 5x5HMHDMD64. This is the 4mm thick highest quality version of this filter. Compare this glass in quality to Tiffen, Schneider, and B+W. Retails originally for $600.

This is a combination filter that acts as both a Hot Mirror (infrared IR) filter and a neutral density filter. It's two valuable filters in one!

ND.6 (exposure adjustment = 2 stops, reduces ISO 14)

The Formatt Hot Mirror/Neutral Density Infrared (IR) Filter - Color shift is a critical factor in digital photography/videography and is directly affected by the infrared spectrum. This is particularly evident when using standard neutral density filters that absorb visible light but pass infrared. Specifically, in high definition photography, the sensitivity of imaging sensors to IR has become a challenge for both photographers, videographers and manufacturers.

Unlike many photographic films, the CCD or CMOS of a digital camera is inherently susceptible to infrared contamination, even when the manufacturer attempts to reduce this problem by adding an infrared absorbing filter on top of the image sensor. Because these filters do not have a sharp cutoff at the infrared wavelengths there has to be a compromise in order not to exclude visible red wavelengths. This results in some infrared wavelengths being allowed to pass.

While minor infrared contamination does not normally cause much of a problem for visible images, when using conventional neutral density filters especially denser grades, this issue is multiplied by the filter factor.

Formatt Neutral Density STD (ND grads) filter produces a gray neutral tone. ND Grads are used to reduce light selectively, enabling more control over exposure without affecting color or contrast. In effect, ND grads allow you to capture scenes of greater contrast or dynamic range than the camera could capture without their use.

Neutral Density Filters Have Four Main Uses:

• To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars
• To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background
• To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations
• To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure

All Formatt filters are manufactured using Water White Schott optical glass that is precision polished and ground to ensure absolute optical flatness and optimum performance.

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Returns accepted for functional problems not mentioned in description or condition significantly different than described. Returns are not accepted for buyer’s remorse, compatibility issue, suitability of purpose, or damage/improper use.