Colored Glass Filters
COLORED GLASS FILTERS
Neutral Density Filters (W-ND)
World standard Neutral density filters (W-ND filters) with top quality and excellent optical performance. W-ND series is designed to match the world standard and different from current line of neutral density glass types in terms of thickness and transmittance.
Neutral density filters can be used for various purposes including adjustment of light amount as the light intensity can be controlled without selectively absorbing light with a specific wavelength (405nm, 546nm and 694nm).
Specification of W-ND series are different from the conventional HOYA ND filters.
Application: Camera
Neutral Density Product Portfolio
HOYA W-ND series | HOYA ND series | |
---|---|---|
Standard Thickness | t1.0mm* | t2.5mm* |
Transmittance | Specified at 405nm, 546nm, 694nm Internal Transmittance |
Average 400-700nm External Transmittance |
*Optical characteristics of W-ND/ND series filters are always made by adjusting thickness of the glass.
Transmittance (Internal Transmittance)
Transmittance (Internal Transmittance): Data
Item | Standard Value | Color specification (Standard illuminants A) | Thickness | Refractive Index | Chemical property | Thermal properties | Mechanical properties | Specific gravity | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
τ405nm | τ546nm | τ694nm | x | y | mm | 600nm | DW | DA | Tg | Ts | α 100/300 | HK | FA | d | |
W-ND9 | 0.025±0.01 | 0.04±0.02 | 0.08±0.02 | 0.463 | 0.404 | 1.00 | 1.521 | 3 | 2 | 490 | 545 | 78 | 415 | 109 | 2.46 |
W-ND3 | 0.06±0.02 | 0.10±0.02 | 0.17±0.03 | 0.454 | 0.404 | 1.00 | 1.516 | 3 | 2 | 485 | 545 | 75 | 416 | 114 | 2.44 |
W-ND4 | 0.27±0.03 | 0.31±0.03 | 0.39±0.04 | 0.445 | 0.405 | 1.00 | 1.508 | 3 | 2 | 490 | 555 | 70 | 417 | 111 | 2.42 |
W-ND5 | 0.56±0.03 | 0.57±0.03 | 0.62±0.03 | 0.446 | 0.408 | 1.00 | 1.506 | 3 | 2 | 490 | 560 | 68 | 416 | 124 | 2.42 |
W-ND11 | 0.76±0.02 | 0.77±0.02 | 0.79±0.02 | 0.446 | 0.408 | 1.00 | 1.504 | 3 | 2 | 485 | 565 | 66 | 423 | 110 | 2.40 |