New narrowband 1.25″ filter

ZWO New Narrowband Filter Set – 1.25″ Size

The ZWO New Narrowband Filter Set is a must-have for astrophotographers looking to capture stunning images of emission nebulae. This filter set includes three filters: H-alpha, OIII, and SII. Designed with high-quality materials and anti-reflection coatings, these filters block all other wavelengths of light except for their respective narrowband wavelengths, enhancing contrast and detail in your images.

Each filter in the set has a 7±0.5nm FWHM bandpass and is fine-optically polished to ensure accurate 1/4 wavefront over both surfaces. The H-alpha filter has about 90% transmission at the H-alpha line (656nm) and an infrared wavelength 700-1100nm cut-off. The OIII filter has about 90% transmission at the OIII line (496nm and 500nm) and a UV/IR cut-off at 400nm and 700nm. The SII filter has about 90% transmission at the SII line (672nm) and a UV/IR cut-off at 400nm and 700nm. All filters have <0.1% transmission of off-band, OD3 (Optical Density).

The filters are fine-optically polished to ensure an accurate 1/4 wavefront over both surfaces. This level of optical polish ensures maximum light transmission and image quality. The 1.25″ size is compatible with a wide range of telescopes and cameras. The filters are 5.5mm thick and have a thread thickness of 2.5mm. They come in a protective case for safe storage.

Features:

• Set includes H-alpha, OIII, and SII filters for capturing emission nebulae
• Blocks all other wavelengths of light except for their respective narrowband wavelengths for improved image quality
• High-quality materials and anti-reflection coatings for excellent optical performance
• 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) for the H-alpha filter
• About 90% transmission at the OIII line (496nm and 500nm) for the OIII filter
• About 90% transmission at the SII line (672nm) for the SII filter
• Infrared wavelength 700-1100nm cut-off for the H-alpha filter
• UV/IR cut-off at 400nm and 700nm for the OIII and SII filters
• <0.1% transmission of off-band, OD3 (Optical Density) for all filters
• 5.5mm thick filters with a thread thickness of 2.5mm
• Comes in a protective case for safe storage