Dual-Band 7nm Nebula Filter for Astrophotography SVBONY

This narrowband filter designed specifically for astrophotography allows you to capture color images even in environments heavily polluted by light. It is particularly useful for photographing emission nebulae, planetary nebulae, and supernova remnants.

Features

• Size: 1.25 inches (31.75 mm)
• Substrate thickness: 1.85 mm
• Clear aperture: 26 mm
• Wavelength range: 300-1100 nm
• FWHM (OIII and HA): 7 nm
• Blocking: >OD5
• Maximum transmittance: 500.7 nm @ T>90%, 656.3 nm @ T>94%
• Surface quality: 60/40
• Surface parallelism: 1/4λ

This filter is designed to eliminate interference caused by artificial light from sodium or mercury street lamps, as well as other unwanted disturbances such as skyglow halo.