SII 7nm Pegasus filter - 2″ mounted

CHF 209

Part no. FILTER-0017

Disponible en stock chez le fournisseur

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Pegasus Astro SII filter (Sulfur II)

The filter Pegasus Astro SII is a high-quality narrow-band filter designed for astrophotography. Here are its detailed features:

Technical specifications

  • Diameter : 50.8 mm (2 inches)
  • Thread : M48 x 0.75 mm
  • Total thickness : 7.5 mm (5 mm filter body + 2.5 mm thread)
  • Glass thickness : 2 mm
  • Bandwidth : 7 nm
  • Central wavelength : 672 nm
  • Transmission : Tave > 80% at 672 nm
  • Polishing : 1/4 wavelength
  • Coating : Anti-reflective multilayer
  • Type : Narrow-band interference filter

Features and benefits

  • Optimum transmission : The filter offers transmission greater than 80% at the central wavelength of 672 nm, corresponding to the emission lines of doubly ionized sulfur (SII).
  • Narrow bandwidth : With a bandwidth of just 7 nm, this filter effectively isolates SII emission lines, enabling excellent separation of spectral details.
  • Parafocality: The SII filter is parafocal with other Pegasus filters, simplifying the image acquisition process.
  • Superior optical quality : The 1/4-wavelength polish guarantees excellent image quality and optimum sharpness.
  • Anti-reflective coating : Multi-layer anti-reflective coating eliminates halos, ghosting and unwanted reflections.
  • Durability: The filter is designed to withstand scratches and temperature changes.
  • UV and IR blocking : The filter effectively blocks UV and IR wavelengths, improving image sharpness and reducing halos.

Astrophotography applications

  • Nebula imaging : Ideal for capturing the details of nebulae rich in ionized sulfur.
  • Reducing light pollution : Its narrow bandwidth enables effective imaging even in areas of high light pollution or under a full moon.
  • False color imaging : Used in the Hubble palette technique (SHO) to create spectacular false-color images.
  • High-resolution imaging : The narrow bandwidth enables high-contrast images to be obtained, revealing fine details in nebular structures.
Filter typeSHO (narrow bands)
Bandwidth7 nm
ParafocusingYes
Wavelength672nm
WeightN/A
In the boxFilter only
Special featuresNarrow-band filter, high transmittance >80%

Why choose Deep Space Astronomy?

Because astronomy is our passion! Our team of experts is here to guide you in your choice of equipment, from beginner telescopes to the most sophisticated astrophotography equipment.

  • Personalized advice: Take advantage of our expertise to choose the ideal instrument for your needs and budget.
  • A wide choice of products: We offer a rigorous selection of quality equipment from the leading brands on the market.
  • Customized training: Expand your knowledge of astronomy with our online and face-to-face training courses.
  • Responsive after-sales service: We're here to help you make the most of your experience.

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