Hoya Pro1 Digital 77mm NDX16 Neutral Density Filter

Neutral Density Filter Characteristics

The Hoya 77mm Pro 1D 16x ND 1.2 Filter is designed to reduce the amount of light entering the lens without affecting color balance, enabling photographers to achieve effects otherwise difficult to capture. This neutral density (ND) filter appears gray and is used to control exposure by decreasing light intensity reaching the camera sensor or film.

Exposure Control and Stops

Neutral Density filters allow adjustment of exposure without altering color balance. They are available in various strengths corresponding to different stops: 1, 2, 3, or 4 stops. The 2-stop filter (ND 0.6) is generally effective for average lighting conditions. The Hoya Pro 1D 16x ND filter corresponds to a 4-stop reduction (ND 1.2), reducing light by a factor of 16.

Construction and Coatings

• Digitally multi-coated glass significantly reduces lens flare and ghosting caused by reflections.
• The filter frame is made from black matte aluminum with a satin finish and an almite coating to prevent corrosion.
• The black rimmed glass reduces light reflection from the filter edges.
• The frame features a knurled edge for easy attachment and removal.
• The filter has a low profile (thin) design, ideal for wide-angle photography and videography.
• Includes a UV-protected plastic storage case to extend filter life.

Applications of Neutral Density Filters

• Enable slow shutter speeds to capture motion effects such as flowing waterfalls, moving clouds, or passing cars.
• Allow use of wider apertures to decrease depth of field, helping to separate subjects from backgrounds.
• Reduce effective ISO of high-speed films (above ISO 400) for outdoor bright light shooting.
• Allow cine and video cameras with fixed shutter speeds to film bright scenes like snow or sand without overexposure.

Neutral Density Filter Factors

• ND 0.3: 1 stop exposure reduction, halves ISO sensitivity.
• ND 0.6: 2 stops exposure reduction, reduces ISO to one quarter.
• ND 0.9: 3 stops exposure reduction, reduces ISO to one eighth.
• ND 1.2: 4 stops exposure reduction, reduces ISO to one sixteenth (this filter).

Additional Benefits

Hoya applies at least one layer of anti-reflective coating on each side of the glass, minimizing flare and ghosting even if the glass is not multi-coated. This enhances image quality and reduces unwanted reflections.