Interference filters
Absoption filters
Quartz Windows
Neutral density filters
Customized optics
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Neutral density filters

Neutral density filters are used to reduce the intensity of an incident light beam over a wider spectral range.

The available filters are based on an applied metal coating on glass substrates.

Applications for such neutral density filters are amongst others:

Designation Optical density Thickness [mm]
ND-0.05-x 0.05 0.7
ND-0.1-x 0.1 0.3
ND-0.15-x 0.15 0.7
ND-0.2-x 0.2 0.3
ND-0.3-x 0.3 0.3
ND-0.5-x 0.5 0.3
ND-0.8-x 0.8 0.3
ND-1.0-x 1.0 0.3
ND-1.2-x 1.2 0.3
ND-1.6-x 1.6 0.3
ND-2.0-x 2.0 0.3
ND-2.3-x 2.3 0.3
ND-2.7-x 2.7 0.3
ND-3.0-x 3.0 0.3

When placing a request or order, please replace the "x" in the table above by the order code for the size needed:

Order code Size or Mount Clear aperture
15 15.0mm round ≥ 12mm round
25 25.0mm round ≥ 22mm round
50 50.0mm round ≥ 49mm round
50x50 50.0x50.0mm square ≥ 49x49mm square
C-Mount C-Mount 25mm ≥ 21mm round
M25.5x0.5 M25.5x0.5 ≥ 21.9mm round
M27.5x0.5 M27.5x0.5 ≥ 22.3mm round
M30x0.5 M30x0.5 ≥ 26.5mm round
M35.5x0.5 M35.5x0.5 ≥ 32.1mm round
M37x0.5 M37x0.5 ≥ 33.2mm round
M39x0.5 M39x0.5 ≥ 35.1mm round
M40.5x0.5 M40.5x0.5 ≥ 36.2mm round
M43x0.75 M43x0.75 ≥ 39.4mm round
M46x0.75 M46x0.75 ≥ 42.3mm round
M49x0.75 M49x0.75 ≥ 45.2mm round
M52x0.75 M52x0.75 ≥ 48.0mm round

Example: ND-0.05-25 is the correct order designation for the first filter of the table with a size of 25.0mm round.

Page updated at: 07/24/2015