Svbony SV240 NIR 2" multi‑bandpass telescope filter

This multi-bandpass astronomical filter helps reduce the effects of urban glow while preserving emission lines for detailed deep sky imaging. Ideal for nebulae and galaxies, the Svbony SV240 can be used on 2 inch telescope systems to improve contrast and retain natural colour, especially when using a near-infrared light pollution filter for astrophotography in mixed light environments.

Key Points

The SV240 is presented as a versatile multiband filter that targets Ha, OIII and H-Beta emission lines while suppressing common light pollution wavelengths, so stars and nebulae appear cleaner and with better separation. According to the manufacturer, it is compatible with around 99% of astrophotography setups, which makes it a practical choice if you switch between different telescopes or camera systems. The glass receives extensive multilayer coating that reportedly enhances signal-to-noise and image contrast, while maintaining a balanced colour response. For urban astrophotographers the filter claims resistance up to Bortle level 8, enabling imaging from many city and suburban locations. 🌃

Technical Specifications

• Name: SVBONY SV240 Multi-Bandpass Filter
• Working wavelength range: 300-1100 nm
• Transmission at central lines: >90%
• FWHM examples: Ha 24 nm, OIII 20 nm, H-Beta 115 nm
• Mount size: 2 inch
• Coatings: 60+80 layer multi-coating with water resistant layer

Benefits

Using this multibandpass filter reduces broadband skyglow while allowing key nebular emissions to pass, so faint structures become more visible without resorting to multiple narrowband filters. The broad spectral coverage means fewer changes of filter are needed for mixed targets, which simplifies field workflow. It also supports colour imaging because the transmission is tuned to keep a natural balance between hydrogen and oxygen lines, helping to record richer hues in composite images. 🔭

Usage Recommendations

Attach the 2 inch filter close to the imaging train to avoid vignetting on fast optical systems. For best results pair it with a DSLR or cooled astronomy camera and long exposure calibration routines. Consider that extremely narrowband monochrome imaging may still benefit from dedicated single-line filters, so if your priority is pure Ha-only mapping, a specific narrowband filter could perform better. Also remember that the quoted transmission and FWHM values come from the manufacturer, and real-world performance can vary with sensor sensitivity and local sky conditions. 🛰️