Baader Filters H-Beta CMOS Narrowband 31mm (76760)

The Narrowband series provides line filters with a full width at half maximum (FWHM) of 6.5 nanometres, recommended for optical systems with aperture ratios ranging from f/10 to f/3.5. This range covers most telescopes commonly used by amateur astronomers. The FWHM is also suitable for smaller apertures, offering excellent performance and great value for money.

Specifications:

Capacity:

• Central Wavelength (nm): 486.1

• Half-Value Width (nm): 5.5

Frame:

• Type: Ring

• Mount Material: Aluminium

• Coating: Reflex-Blocker™

Compatibility:

• Filter Thickness (mm): 2

• Appropriate for Telescopes: f/15 to f/1.8

• Filter Size (mm): 31

General Information:

• Type: Filters

• Build Type: Line filter

• Series: Narrowband

Area of Application:

• Useful for Photographs: Yes

• Visually Useful: Yes

• Twin Stars Observation: No

• Moon & Planets Observation: No

• Nebulae & Galaxies Observation: Yes