Pegasus Astro H-alpha (Hα) filter
The filter Pegasus Astro H-alpha (Hα) 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)
- Bandwidth : 7 nm
- Central wavelength : 656 nm
- Transmission : Tave > 80% at 656 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 656 nm, corresponding to the hydrogen alpha emission line.
- Narrow bandwidth : With a bandwidth of just 7 nm, this filter effectively isolates the Hα emission line, enabling excellent separation of spectral details.
- Parafocality: Like all Pegasus Astro filters, the Hα filter is parafocal with the other filters in the series, 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
- Imaging emission nebulae : Ideal for capturing the details of nebulae rich in ionized hydrogen.
- Reducing light pollution : Narrow bandwidth enables effective imaging even in areas of high light pollution.
- 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.
Conclusion
In conclusion, the filter Hα Pegasus Astro is a high-quality tool for specialized astrophotography, offering excellent transmission in a narrow band centered on the hydrogen alpha emission line.
Reference and Configuration
| Brand |
Pegasus Astro |
| Manufacturer reference |
PEG-FLTR-2M-Ha |
| Model / Configuration |
2-inch mounted photographic filter — Ha 7 nm |
How do I check for compatibility?
Before setting up your system, compare the exact part number, generation, and connection types of your equipment with the manufacturer’s documentation. An accessory from a different generation is not necessarily interchangeable.
Documentation: Pegasus Astro, manufacturer information. To verify a specific assembly, provide the part number PEG-FLTR-2M-Ha to Deep Space Astronomy.
