Fuzhou Esteemoptics Co.,Ltd

FEATURED IN OPTICAL COATING, HIGH POWER MIRRORS, BANDPASS FILTERS, PRECISION OPTICS.

PRODUCTS > OPTICAL COMPONENTS > FILTERS > NEUTURAL DENSITY FILTER

¨ Exposure control in color photography

¨ Calibration filters

¨ Light control in various instruments

APPLICATIONS

Neutral Density Glass Type

How to Order:

For Example: NDG0020

(Part Number)

Notes:

Other size are also available upon request.

Optical Density	Transmission	Thickness(mm)     Appr.	φ 25mm	50x50mm
			Part No.	Part No.
0.04	92.0%	2.00	NDG0004	NDG0104
0.1	79.4%	1.35	NDG0010	NDG0110
0.2	63.1%	3.44	NDG0020	NDG0120
0.3	50.1%	2.40	NDG0030	NDG0130
0.4	39.8%	3.31	NDG0040	NDG0140
0.5	31.6%	1.84	NDG0050	NDG0150
0.8	15.8%	3.03	NDG0080	NDG0180
1.0	10.0%	2.05	NDG0100	NDG0101
2.0	1.0%	4.19	NDG0200	NDG0102
3.0	0.1%	1.50	NDG0300	NDG0103
4.0	0.0%	2.05	NDG0400	NDG0114

Specifications:

Material: Optical Neutral Density Glass

Flatness: 2λ per 25 mm

Surface Quality: 80/50

Parallelism: 3 min

Dimension Tolerance: +/-0.2mm

Optical Density Tolerance: +/-10%

Overview

Neutral density (ND) filters reduce light intensity in the visible region of 400 to 700 wavelength range.

Neutral density glass characteristics may vary with melting conditions but the filter performance can be compensated by changing the filter glass thickness.

Optical Density: D

Transmittance: T

D=Log(1/T)

Metallic Coating Type

	Size(mm)	BK7 φ25X2	BK7 50X50X2	F.S. φ25X2
Optical Density	Transmission	Part No.	Part No.	Part No.
0.1	79.4%	NMC0101	NMC0201	NMC1101
0.2	63.1%	NMC0102	NMC0202	NMC1102
0.3	50.1%	NMC0103	NMC0203	NMC1103
0.5	31.6%	NMC0105	NMC0205	NMC1105
0.8	15.8%	NMC0108	NMC0208	NMC1108
1.0	10%	NMC0110	NMC0210	NMC1110
2.0	1%	NMC0120	NMC0220	NMC1120
3.0	0.1%	NMC0130	NMC0230	NMC1130
4.0	0.01%	NMC0140	NMC0240	NMC1140

Specifications:

Material: BK7 glass  and  Fused Silica

Flatness: 2λ per 25 mm

Surface Quality: 80/50

Parallelism: 3 min.

Dimension Tolerance: +/-0.2mm

Coating: Vacuum-deposited metallic alloy

Optical density Tolerance: +/-10%