Telephone: +44 (0) 1268 728077 | Fax: +44 (0) 1268 590445
Telephone: +44 (0) 1268 728077
Stock Specification
Absorptive HOYA ® glass Neutral Density (nd) filters are used to control the intensity of light. The filters are stackable without resulting in multiple reflections. The HOYA nd glass absorbs the light within the filter. Each glass type is polished to a specific thickness and measured to produce the exact optical density and transmission. Custom or standard optical density’s and transmission can be produced to individual wavelengths.
MATERIAL: |
HOYA ® Filter Glass |
|
SURFACE QUALITY: |
Ø12.5mm ≤ 3 fringes |
DIAMETER TOLERANCE: |
+0.0 / -0.2mm |
|
SURFACE QUALITY: |
Ø25.0mm ≤ 5 fringes |
SQUARE TOLERANCE: |
± 0.2mm |
|
SURFACE QUALITY: |
Ø50.0mm ≤ 8 fringes |
THICKNESS TOLERANCE: |
± 0.2mm |
|
PARALLELISM: |
≤ 3 arc minutes |
SURFACE QUALITY: |
60/40 |
|
EDGES: |
fine ground |