Colored Glass Filters
COLORED GLASS FILTERS
HOYA Standard Specification
Standard specification of the filters we manufacture is as follows.
We also comply with the requirement from the customers. Please ask more details to our sales representatives.
| Quality Item | Standard | Hi Precision |
|---|---|---|
| Reference Size | 50mm X 50mm | 50mm X 50mm |
| Clear Apparture | 90% | 90% |
| Standard Thickness (*) | 2.5 mm | 2.5 mm |
| Surface Roughness | P2 (Rq < 4nm) | P3 (Rq < 2nm) |
| Flatness | 3/5(1); λ=632.8nm | 3/3(1); λ=632.8nm |
| Wavefront Distortion | 13/3(0.5); λ=632.8nm | 13/1(0.5); λ=632.8nm |
| Parallelism | Within 2 minutes | Within 1 minute |
| Bubbles, Inclusions | 1/6 X 0.16 | 1/3 X 0.063 |
| Pits, Sleeks, Scuffs, Scratches, Bubbles and Inclusions on surface | 5/8 X 0.1 L3 X 0.016 (Total length of scratches should not exceed half of the clear aperture dimension which is defined as a circle of 90% in the center of the surface area) | 5/3 X 0.063 L3 X 0.006 (Total length of scratches should not exceed half of the clear aperture dimension which is defined as a circle of 90% in the center of the surface area) |
| Striae | Within specification of transmitted wavefront | Within specification of transmitted wavefront |
| Chip Standard Chamfer 0.3 | Allowed within chamfer E0.25 | Allowed within chamfer E0.25 |
The above standard comply with ISO10110 series
- (*)
- Exclude thickness of LA/LB/ND filters
C filters follows HOYA color filter catalog
Standard thickness defines to meet optical characteristics according to HOYA filter catalog