Absorptive Neutral Density Filter, Operating Wavelength Band: 400-650 nm OFA1-20M
JCOPTIX absorptive ND filters use SCHOTT NG glass for uniform absorption-based attenuation over visible 400-600 nm. Varying glass type/thickness creates the complete series. Actual thickness depends on batch glass OD. Optical Density (OD) expresses incident-intensity attenuation, related to transmission by T=10⁻OD, with T between 0 and 1. Higher OD gives lower transmission and higher absorption. Stacked densities add. Slight tilt avoids harmful etalon interference. JCOPTIX round/square absorptive filters cover OD 0.1-8.0; contact support for other sizes, shapes, or ODs. Absorptive ND wheel kit, 400-650 nm. Model: OFA1-M1. Uniform attenuation over 400-650 nm. OD 1.0-6.0, 6 options. Compatible with 30 mm systems. Blind rod holes protect filters. JCOPTIX SCHOTT NG filters uniformly attenuate visible 400-650 nm by absorption. Changing glass type/thickness creates the full series. Tilt slightly to avoid etalon interference. Six preassembled filters, OD=1.0, 2.0, 3.0, 4.0, 5.0, 6.0, mount in a standard 30mm MCW6 wheel. Laser-marked OD at each tube top simplifies identification. Mounted absorptive ND kit. Model: OFK1. Uniform broadband attenuation. OD coverage: 0.1-8.0. Low-/medium-power lasers. JCOPTIX filters provide uniform absorption-based attenuation across broad bands. Varying substrate type/thickness creates the complete series. Slight tilt avoids harmful etalon interference.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | Neutral-density filter glass |
| Dimensions | Ø25.4 mm |
| Thickness | 2.3 mm |
| Clear Aperture Dimension | >90% of Outer Diameter |
| Dimensional Tolerance | +0.0/-0.25 mm |
| Coating | Uncoated |
| Surface Flatness [@633 nm] | < λ/4 |
| Surface parallelism | < 10 arcsec |
| Surface quality (scratch/dig) | 40/20 |
| Mechanical housing | Standard lens tube SM1L6-A |
| Optical Density Tolerance | ± 0.1 |
| Optical density (OD) value | 2.0 |
| Operating Wavelength Band | 400-650 nm |
Key Features
Datasheet
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