Short pass filter is the filter in which the pass band is a wavelength range lower than the wavelength range that is blocked. Short pass filters pass all wavelengths shorter than the cut off wavelength. Short pass filters include IR cutoff filters, hot mirrors, and heat absorbing filters.
| ATTRIBUTE | SPECIFICATIONS |
| material | N-BK7, Fused Silica or specified |
| DIAMETER TOLERANCE | +0.1, -0.1mm |
| thickness TOLERANCE | +/-0.1mm |
| CLEAR APERTURE | >80% |
| SURFACE QUALITY | 60/40 scratch and dig |
| BEVEL | < 0.2 mm x 45° |
| COATING | Surface 1: Multi-layer dielectric coating Surface 2: With AR coating |
| Slope | 90% - 10% < 10nm |
| Blocking | Optical density, OD > 4 |
