Infrared Cut-Off Filters
Note: This section applies to CS-mount, color, cased or partial cased models. It does not apply to board-level, or CS-mount mono, or S‑mount models.
Color CS-mount models are equipped with an additional infrared (IR) cut-off filter. This filter can reduce sensitivity in the near infrared spectrum and help prevent smearing. The properties of this filter are illustrated in the results below.
IR filter transmittance graph
| Transmission | Wavelength |
|---|---|
| T=50% | 680 nm ±10 nm |
| T>80% | 400 nm - 420 nm |
| T>85% | 420 nm - 650 nm |
| T average 1% | 750 nm - 1100 nm |
| T<3% | 750 nm - 1100 nm |
The following are the properties of the IR filter glass:
| Properties | |
|---|---|
| Type | Anti-reflective |
| Material | Schott B270 |
| Dimensions | 14 ±0.08 x 14 ±0.08 mm |
| Thickness | 1 ±0.07 mm |
For more information, see Dust Protection—Cased Models.
Warning! Use caution when removing the IR filter. Damage to any component of the optical path voids the Hardware Warranty. Removing the IR filter alters the optical path of the camera, and may result in problems obtaining proper focus with your lens.
| Removing the IR filter from a color camera |
