The ZWO Duo-Band Filter is a versatile filter designed for astrophotography. It allows you to capture both H-alpha and OIII wavelengths in one shot, making it ideal for capturing emission nebulae. The filter is designed with high-quality materials and anti-reflection coatings, which block all other wavelengths of light except for the narrowband wavelengths it is designed to capture.
The filter has a 7±0.5nm FWHM bandpass for both the H-alpha and OIII wavelengths and is fine-optically polished to ensure an accurate 1/4 wavefront over both surfaces. It has about 90% transmission at the H-alpha line (656nm) and about 90% transmission at the OIII line (496nm and 500nm). It also has an infrared wavelength 700-1100nm cut-off and a UV/IR cut-off at 400nm and 700nm. The filter has a <0.1% transmission of off-band, OD3 (Optical Density).
The ZWO Duo-Band filter is 1.25″ in size, which is compatible with a wide range of telescopes and cameras. The filter is 5.5mm thick and has a thread thickness of 2.5mm. It comes in a protective case for safe storage.
Feedback about the ZWO Duo-Band filter online has been positive. Users have praised its ability to capture both H-alpha and OIII wavelengths in one shot, which saves time and reduces the complexity of astrophotography. They have also noted its high-quality materials and anti-reflection coatings, which result in excellent image quality.
Summary of feedback:
- Users praise its ability to capture both H-alpha and OIII wavelengths in one shot
- High-quality materials and anti-reflection coatings result in excellent image quality
- Compatible with a wide range of telescopes and cameras
- 7±0.5nm FWHM bandpass for precise filtering
- Fine-optically polished to ensure accurate 1/4 wavefront over both surfaces for maximum light transmission and image quality
- About 90% transmission at the H-alpha line (656nm) and about 90% transmission at the OIII line (496nm and 500nm)
- Infrared wavelength 700-1100nm cut-off and UV/IR cut-off at 400nm and 700nm
- <0.1% transmission of off-band, OD3 (Optical Density)
- 5.5mm thick filter with a thread thickness of 2.5mm
- Comes in a protective case for safe storage.
Jerald Jacob (verified owner) –