Photo of Andover's IR ND filters
  • Provides attenuation with greater linearity over a wide spectral range
  • Delivers superior durability
  • Custom substrates available

IR Neutral Density Filters

Metallic-coated infrared neutral density filters (IR ND filters) obtain their optical density from a metal alloy coating on a substrate determined by the wavelength region of interest. Unlike the all-dielectric or absorption type, the metallic type ND filter employs a combination of absorption and reflection to reduce the intensity of light. 

Andover's IR ND filters exhibit outstanding spectral neutrality, outperforming all others on the market.

General Specifications:
Dimensional Tolerances:±0.2mm
Thickness: 1.0mm
Min. Clear Aperture: 90% of outside dimension
Surface Quality: 80/50 per MIL-O-13830B
Coating Quality: 80/50 per MIL-O-13830B
Coating Adherence: Per MIL-M-13508C
Humidity: Per MIL-STD-810F
Substrate Material: Germanium
Flatness: 3–5 waves per 25mm
Parallelism: 10 arc minutes or better
Mechanical:Unmounted

Note: Custom sizes and spectral characteristics available on request. Contact our technical sales department for a quotation.

DESCRIPTION PART NO. 1-5 pcs. >5 pcs. QTY IN STOCK QTY
+ IR ND, 0.30 OD, 25.0 mm diameter 030FNIR-25 $240 $204 30
Description Standard IR ND Filter, OD=0.3, 25mm diameter
CSV File (typical) 030FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.30 OD, 50.0 mm diameter 030FNIR-50 $497 $422 11
Description Standard IR ND Filter, OD=0.3, 50mm diameter
CSV File (typical) 030FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.50 OD, 25.0 mm diameter 050FNIR-25 $240 $204 19
Description Standard IR ND Filter, OD=0.5, 25mm diameter
CSV File (typical) 050FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.50 OD, 50.0 mm diameter 050FNIR-50 $497 $422 4
Description Standard IR ND Filter, OD=0.5, 50mm diameter
CSV File (typical) 050FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.60 OD, 25.0 mm diameter 060FNIR-25 $240 $204 6
Description Standard IR ND Filter, OD=0.6, 25mm diameter
CSV File (typical) 060FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.60 OD, 50.0 mm diameter 060FNIR-50 $497 $422 4
Description Standard IR ND Filter, OD=0.6, 50mm diameter
CSV File (typical) 060FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.70 OD, 25.0 mm diameter 070FNIR-25 $240 $204 4
Description Standard IR ND Filter, OD=0.7, 25mm diameter
CSV File (typical) 070FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.70 OD, 50.0 mm diameter 070FNIR-50 $497 $422 0
Description Standard IR ND Filter, OD=0.7, 50mm diameter
CSV File (typical) 070FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.80 OD, 25.0 mm diameter 080FNIR-25 $240 $204 5
Description Standard IR ND Filter, OD=0.8, 25mm diameter
CSV File (typical) 080FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.80 OD, 50.0 mm diameter 080FNIR-50 $497 $422 0
Description Standard IR ND Filter, OD=0.8, 50mm diameter
CSV File (typical) 080FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: approximately 1 week.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.9 OD, 25.0 mm diameter 090FNIR-25 $240 $204 7
Description Standard IR ND Filter, OD=0.9, 25mm diameter
CSV File (typical) 090FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 0.9 OD, 50.0 mm diameter 090FNIR-50 $497 $422 10
Description Standard IR ND Filter, OD=0.9, 50mm diameter
CSV File (typical) 090FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 1.0 OD, 25.0 mm diameter 100FNIR-25 $240 $204 25
Description Standard IR ND Filter, OD=1.0, 25mm diameter
CSV File (typical) 100FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 1.0 OD, 50.0 mm diameter 100FNIR-50 $497 $422 14
Description Standard IR ND Filter, OD=1.0, 50mm diameter
CSV File (typical) 100FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 1.3 OD, 25.0 mm diameter 130FNIR-25 $240 $204 9
Description Standard IR ND Filter, OD=1.3, 25mm diameter
CSV File (typical) 130FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 1.3 OD, 50.0 mm diameter 130FNIR-50 $497 $422 2
Description Standard IR ND Filter, OD=1.3, 50mm diameter
CSV File (typical) 130FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 1.5 OD, 25.0 mm diameter 150FNIR-25 $240 $204 20
Description Standard IR ND Filter, OD=1.5, 25mm diameter
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 1.5 OD, 50.0 mm diameter 150FNIR-50 $497 $422 11
Description Standard IR ND Filter, OD=1.5, 50mm diameter
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 2.0 OD, 25.0 mm diameter 200FNIR-25 $240 $204 12
Description Standard IR ND Filter, OD=2.0, 25mm diameter
CSV File (typical) 200FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 2.0 OD, 50.0 mm diameter 200FNIR-50 $497 $422 10
Description Standard IR ND Filter, OD=2.0, 50mm diameter
CSV File (typical) 200FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 2.5 OD, 25.0 mm diameter 250FNIR-25 $240 $204 5
Description Standard IR ND Filter, OD=2.5, 25mm diameter
CSV File (typical) 250FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 2.5 OD, 50.0 mm diameter 250FNIR-50 $497 $422 7
Description Standard IR ND Filter, OD=2.5, 50mm diameter
CSV File (typical) 250FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 3.0 OD, 25.0 mm diameter 300FNIR-25 $240 $204 13
Description Standard IR ND Filter, OD=3.0, 25mm diameter
CSV File (typical) 300FNIR.csv
Graph Test
QtyPrice
1-5 $240
6+ $204
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.
+ IR ND, 3.0 OD, 50.0 mm diameter 300FNIR-50 $497 $422 2
Description Standard IR ND Filter, OD=3.0, 50mm diameter
CSV File (typical) 300FNIR.csv
Graph Test
QtyPrice
1-5 $497
6+ $422
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
Click icon to display graph.