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Optical Crown Glass Metallic Neutral Density Filters

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Overview

Our metallic neutral density coatings provide broadband attenuation for low power applications. The coating is deposited on one side of a cost effective B 270 optical glass substrate, providing excellent performance in the visible and near-infrared.

Cost effective optical crown glass
Broadband attenuation, visible to near IR
Metallic neutral density coating
For lower power applications
Available in convenient kits

See All Features

Products

Compare	Model	Compatibility	rankScore	Size	Optical Density	Optical Density Tolerance	Availability	Price	Brand
FBR-ND004 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.04 OD at 632.8 nm $41 In Stock	FBR-ND004 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.04 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	0.04	±2.5% @ 632.8 nm	In Stock	$41	Newport
FBR-ND01 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.1 OD at 632.8 nm $59 In Stock	FBR-ND01 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.1 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	0.1	±8% @ 632.8 nm	In Stock	$59	Newport
FBR-ND02 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.2 OD at 632.8 nm $59 In Stock	FBR-ND02 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.2 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	0.2	±7% @ 632.8 nm	In Stock	$59	Newport
FBR-ND03 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.3 OD at 632.8 nm $59 In Stock	FBR-ND03 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.3 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	0.3	±6% @ 632.8 nm	In Stock	$59	Newport
FBR-ND04 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.4 OD at 632.8 nm $59 In Stock	FBR-ND04 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.4 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	0.4	±5% @ 632.8 nm	In Stock	$59	Newport
FBR-ND05 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.5 OD at 632.8 nm $59 In Stock	FBR-ND05 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 0.5 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	0.5	±4% @ 632.8 nm	In Stock	$59	Newport
FBR-ND10 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 1.0 OD at 632.8 nm $59 In Stock	FBR-ND10 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 1.0 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	1	±4% @ 632.8 nm	In Stock	$59	Newport
FBR-ND15 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 1.5 OD at 632.8 nm $59 In Stock	FBR-ND15 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 1.5 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	1.5	±4% @ 632.8 nm	In Stock	$59	Newport
FBR-ND20 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 2.0 OD at 632.8 nm $59 In Stock	FBR-ND20 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 2.0 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	2	±4% @ 632.8 nm	In Stock	$59	Newport
FBR-ND25 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 2.5 OD at 632.8 nm $59 In Stock	FBR-ND25 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 2.5 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	2.5	±4% @ 632.8 nm	In Stock	$59	Newport
FBR-ND30 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 3.0 OD at 632.8 nm $59 In Stock	FBR-ND30 ND Filter, Metallic, Optical Crown Glass, 25.4 mm, 3.0 OD at 632.8 nm	UNIVERSAL	1.0	Ø25.4 mm	3	±4% @ 632.8 nm	In Stock	$59	Newport
FBS-ND004 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8mm, 0.04 OD $68 Show	FBS-ND004 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8mm, 0.04 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	0.04	±2.5% @ 632.8 nm	Show	$68	Newport
FBS-ND01 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.1 OD $74 In Stock	FBS-ND01 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.1 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	0.1	±8% @ 632.8 nm	In Stock	$74	Newport
FBS-ND02 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.2 OD $74 In Stock	FBS-ND02 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.2 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	0.2	±7% @ 632.8 nm	In Stock	$74	Newport
FBS-ND03 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.3 OD $74 In Stock	FBS-ND03 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.3 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	0.3	±6% @ 632.8 nm	In Stock	$74	Newport
FBS-ND04 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.4 OD $74 In Stock	FBS-ND04 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.4 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	0.4	±5% @ 632.8 nm	In Stock	$74	Newport
FBS-ND05 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.5 OD $74 In Stock	FBS-ND05 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 0.5 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	0.5	±4% @ 632.8 nm	In Stock	$74	Newport
FBS-ND10 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 1.0 OD $74 In Stock	FBS-ND10 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 1.0 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	1	±4% @ 632.8 nm	In Stock	$74	Newport
FBS-ND15 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 1.5 OD $74 In Stock	FBS-ND15 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 1.5 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	1.5	±4% @ 632.8 nm	In Stock	$74	Newport
FBS-ND20 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 2.0 OD $74 In Stock	FBS-ND20 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 2.0 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	2	±4% @ 632.8 nm	In Stock	$74	Newport
FBS-ND25 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 2.5 OD $74 In Stock	FBS-ND25 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 2.5 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	2.5	±4% @ 632.8 nm	In Stock	$74	Newport
FBS-ND30 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 3.0 OD $74 In Stock	FBS-ND30 ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 3.0 OD	UNIVERSAL	1.0	50.8 x 50.8 mm	3	±4% @ 632.8 nm	In Stock	$74	Newport

Show All

Specifications

Wavelength Range

400-1200 nm
Angle of Incidence

0°
Material

B270 Optical Crown Glass or Equivalent
Damage Threshold

30 W/cm² CW, typical; not recommended for pulsed laser use
Size Tolerance

+0/-0.50 mm
Thickness

3.0 mm
Thickness Tolerance

±0.25 mm

Surface Flatness

≤5λ at 632.8 nm over the clear aperture
Surface Quality

60-40 scratch-dig
Clear Aperture

≥central 80% of dimensions
Wedge

≤5 arc min
Chamfers

0.25–0.76 mm face width
Chamfers Angle Tolerance

45° ±15°
Cleaning

See How to Clean Optics

Specifications

Wavelength Range

400-1200 nm
Angle of Incidence

0°
Material

B270 Optical Crown Glass or Equivalent
Damage Threshold

30 W/cm² CW, typical; not recommended for pulsed laser use
Size Tolerance

+0/-0.50 mm
Thickness

3.0 mm
Thickness Tolerance

±0.25 mm

Surface Flatness

≤5λ at 632.8 nm over the clear aperture
Surface Quality

60-40 scratch-dig
Clear Aperture

≥central 80% of dimensions
Wedge

≤5 arc min
Chamfers

0.25–0.76 mm face width
Chamfers Angle Tolerance

45° ±15°
Cleaning

See How to Clean Optics

Features

Finely Control Beam Attenuation

Filters from this product family may be used individually, or combined in series, to obtain any desired density from 0 to 7 in steps of 0.1OD. Please note that stacking an excessive number of filters may lead to numerous unwanted back reflections. All filters are shipped with a transmission curve.

ND Filter Sets

The FB-ND Optical Crown Glass Metallic Neutral Density Filter Set is a set of eight 25.4 mm diameter optical crown glass metallic ND filters of OD 0.04, 0.1, 0.3, 0.5, 1.0, 2,0 and 3.0, which includes a wood case. Our metallic neutral density coatings provide broadband attenuation for low power applications. The coating is deposited on one side of a cost-effective B 270 optical glass substrate, providing excellent performance in the visible and NIR. Filter kits provide convenience and cost savings. All filters are shipped with a transmission curve.

Additive Optical Densities

Optical density (OD) is given by the relationship: OD = -log(T) or T = 10^(-OD) where T is transmittance (0≤T≤1). Optical Density, unlike transmittance, is additive. When multiple filters are stacked, the total density is easily found by adding up the densities of each filter in the series. For example to achieve desired transmittance of 8%, first calculate the equivalent density (OD = -log(0.08) = 1.097 ≅ 1.1), then find a combination of filters that adds to the desired number, such as a combination of an OD1 filter and an OD0.1 filter.

Proper Orientation

To prevent unwanted interference from etalon effects, filters should be angled slightly with respect to the incident beam. To minimize back reflections, the filter should be oriented with the coated metallic surface facing the incident beam. Any light reflected from the uncoated second surface will pass through the metallic coating first, which will greatly attenuate unwanted back reflections.