概述
Peculiarity:
- Multiple sizes available
- Optical Density (OD) Range: 0.1-4
- Low power applications
Neutral density filters absorb or reflect untransmitted light, thereby uniformly reducing the transmittance of a certain part of the spectrum, which can be used to avoid damage to camera sensors or other optical components caused by strong light, and is usually used in imaging or laser applications. Absorption neutral density filters generally refer to the absorption of some specific wavelengths of light by the material itself or after doping certain elements in the material, while the effect on other wavelengths of light occurs less or nothing.
Usually, the damage threshold of absorbent neutral density filters is lower, and after long-term use, heat may occur, so you need to pay attention when using it.
General parameters
| Material | Neutral absorbent glass | Dimensional tolerances(mm) | +0.0/-0.2 | 
| Thickness tolerance(mm) | ±0.2 | Through-light aperture | >90% | 
| Face shape | <2λ@632.8nm | Parallelism | <5ˊ | 
| Optical density tolerance | Outside diameter±10% | Surface | 80/50 | 
| Coating | According to customer requirements | 
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