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TECHSPEC® Absorptive Neutral Density (ND) Filters

Absorptive Neutral Density (ND) Filters

These filters possess level spectral transmittance characteristics in the visible region and attenuate light by absorption with minimal reflection. Typically, neutrality and density of absorptive filters are a function of the material and the thickness. Since Hoya neutral density filters are held to a specific optical density, the thickness is only a function of the glass type. They are useful in light control applications for measuring instruments and exposure control in imaging. Spectral variations occur as optical density increases.

Optical Density exhibits an additive relationship; for example, stacking filters with OD values of 0.6 and 0.9 yields a resultant density of 1.5. The optical density is related to the transmission by the following equation: T = 10^-OD x 100 = percent transmission.

Absorptive Neutral Density Filter Kits

#55-222 includes 6 filters in optical density values of 0.15, 0.3, 0.4, 0.6, 0.9 and 2.5. Wooden Box with foam lining included.

#63-468, #63-469, #63-470 and #66-155 each include 14 filters in optical density values of 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9, 1.0, 1.3, 1.5, 2.0 and 2.5. Please note that OD 3.0 is the only one not included in these kits. Wooden Box with foam lining included.


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Description Stock No. Price In Stock Qty
Showing 1-20 of 65 Items | Show All Items Sort by Spec
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Absorptive ND Filter 0.1 Optical Density 12.5mm Dia
#63-456 In Stock and Ready to Ship.
Absorptive ND Filter 0.1 Optical Density 25mm Dia
#63-460 In Stock and Ready to Ship.
Absorptive ND Filter 0.1 Optical Density 50mm Sq
#63-464 In Stock and Ready to Ship.
Absorptive ND Filter 0.1 Optical Density 50mm Dia
#65-808 In Stock and Ready to Ship.
Absorptive ND Filter 0.15 Optical Density 12.5mm Dia
#48-523 In Stock and Ready to Ship.
Absorptive ND Filter 0.15 Optical Density 25mm Dia
#46-211 In Stock and Ready to Ship.
Absorptive ND Filter 0.15 Optical Density 50mm Sq
#46-217 In Stock and Ready to Ship.
Absorptive ND Filter 0.15 Optical Density 50mm Dia
#65-809 In Stock and Ready to Ship.
Absorptive ND Filter 0.2 Optical Density 12.5mm Dia
#63-457 In Stock and Ready to Ship.
Absorptive ND Filter 0.2 Optical Density 25mm Dia
#63-461 In Stock and Ready to Ship.
Absorptive ND Filter 0.2 Optical Density 50mm Sq
#63-465 In Stock and Ready to Ship.
Absorptive ND Filter 0.2 Optical Density 50mm Dia
#65-810 In Stock and Ready to Ship.
Absorptive ND Filter 0.3 Optical Density 12.5mm Dia
#48-524 In Stock and Ready to Ship.
Absorptive ND Filter 0.3 Optical Density 25mm Dia
#46-212 In Stock and Ready to Ship.
Absorptive ND Filter 0.3 Optical Density 50mm Sq
#46-218 In Stock and Ready to Ship.
Absorptive ND Filter 0.3 Optical Density 50mm Dia
#65-811 In Stock and Ready to Ship.
Absorptive ND Filter 0.4 Optical Density 12.5mm Dia
#48-525 In Stock and Ready to Ship.
Absorptive ND Filter 0.4 Optical Density 25mm Dia
#46-213 In Stock and Ready to Ship.
Absorptive ND Filter 0.4 Optical Density 50mm Sq
#46-219 In Stock and Ready to Ship.
Absorptive ND Filter 0.4 Optical Density 50mm Dia
#65-812 In Stock and Ready to Ship.
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