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高通濾光片在短波區域(截止區域)內具有低穿透率，在長波區域(通過區域)內具有高穿透率。
Longpass filter kits are available in three different options: UV-VIS, VIS, or VIS-NIR. Each kit contains 8 filters in either 12.5mm diameter, 1" diameter, or 2" square. Wooden box with foam lining is included.
Complete filter kits available with 12.5mm diameter, 50.0mm diameter, 1" diameter, or 2" square filters. Each kit contains all 37 Longpass Glass Color Filter types.
Click here to download HOYA’s colored glass filter simulation software which can be used to calculate the internal transmittance and external transmission of each HOYA glass type. The software can simulate the performance of individual filters with user specified thickness.
| λs | limit of stopband: specified at 0.001% internal transmittance |
| λc | cut-off position: specified at 50% internal transmittance |
| λp | limit of the passband |
| tip | internal spectral transmittance at λp |
| ρ | density |
| Tg | transformation temperature |
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