Product type: Thin Film Filter. Application: Lighting, Medical, Optical, Photography, Astronomy.
Overview
Dia25.4xt2.5mm 400-900nm Coated Optical Neutral ND Filter: a neutral density filter made from Glass. Listed geometry: diameter 25.4+/-0.1mm, thickness 2.5+/-0.1mm. Surface quality 60-40. Listed for Lighting, Medical, Optical, Photography and Astronomy applications. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Material | Glass |
|---|---|
| Type | Thin Film Filter |
| Shape | Customized |
| Diameter | 25.4+/-0.1mm |
| Thickness | 2.5+/-0.1mm |
| Surface quality | 60-40 |
| Parallelism | <3arcmin |
| Clear aperture | >90% |
| Usage | Lighting, Medical, Optical, Photography, Astronomy |
| Thickness Range | 2mm-5mm |
| Color | Transparent |
| Principle | Selective Absorption Filter |
| Angle of incidence | 45° |
| Materials we already use | optical glass, materials, and even some plastics. |
| Specifications | Items |
| ROC1 | infinity |
| ROC2 | infinity |
| Chamfer | protected |
| ND filter coating,T=0.04%-0.087%@400-900nm,AOI | 0deg |
| Standard | MIL-PRF-13830B |
| Applications | . fluorescence microscopy |
| Supplier | CPG OPTICS LIMITED |
Technical data
| Items | Description | |
| ND Filter | Material: | Schott N-BK7 |
| Diameter: | 25.4+/-0.1mm | |
| Thickness: | 2.5+/-0.1mm | |
| ROC1: | infinity | |
| ROC2: | infinity | |
| Flatness: | N/A | |
| Surface quality: | 60-40 | |
| Parallelism: | <3arcmin | |
| Clear aperture: | >90% | |
| Chamfer: | protected | |
| Standard: | MIL-PRF-13830B |
What to specify when you request a quote
- Spectral target — state the centre or edge wavelength, the bandwidth and the minimum transmission in the passband.
- Blocking — give the blocking range and optical density (OD) the system needs.
- Angle of incidence — listed as “45°”; interference filters shift with angle, so specify the operating angle and cone.
- Size and thickness — listed as “25.4+/-0.1mm”; give outline, thickness and tolerance, and whether the filter is mounted.
- Substrate — listed as “Glass”; name the substrate glass if thermal or UV behaviour matters.
- Surface quality — listed as “60-40”; quote scratch-dig for imaging paths.
Engineering guides for this part
For material grades and coating options, see How to Select Neutral Density Filter Glass for Optical Instruments. For an application example, read Precision Neutral Density Filter Glass for Appliance Optical Sensors. A related standard product is Neutral Density (ND) Filter.
