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New narrowband 1.25″ filter

$403.77

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. light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

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SKU: ASC5296 Categories: , ,
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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

 

Weight0.2 kg
Dimensions7.5 × 7.5 × 20 cm

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Size: 1.25″

Thickness: 5.5mm+2.5mm(thread)

Glass thickness: 1.85mm

Thread: M28.5*0.6 male thread

  • FWHM:7±0.5nm
  • Glass Thickness 2.0+/-0.03 mm  (1.25”/31mm/36mm)
  • Fine-optically polished to ensure accurate 1/4 wavefront  over the both surfaces
  • About 90% transmission at H-alpha line 656nm (H-Alpha filter )
  • About 90% transmission at SII line 672nm (SII filter )
  • About 90% transmission at major OIII line 500nm (OIII filter )
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3(Optical Density)
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