Narrowband filters are filters that only allow a narrow range of frequencies to pass through while blocking all other frequencies. This is a direct contrast to broadband filters, enabling a wide range of frequencies while blocking unwanted ones. Narrowband filters have revolutionized astrophotography by only allowing a very narrow bandwidth of light through them, making astrophotography possible through even the worst light pollution conditions!
Dimension Tolerance | +0-0.1mm |
Thickness Tolerance | +/-0.1mm |
Surface quality | 60-40 |
TWE | λ/4@633nm |
Clear Aperture | >90% |
CWL Tolerance | +/-2nm |
FWHM | 12+/-2nm |
Peak Transmission | >70% |
Blocking | <0.1%@300-1200nm |
Blocking depth | OD 4 |
Parallelism | <1 arc minute |
* Remark:Customized is available |