SVBONY SV220 Telescope Filter, Dual-Band Nebula Filter, H-Alpha and O-III Narrowband Filter for One-Shot Color Cameras, Light Pollution Filter for Astrophotography (1.25 inches)

SVBONY H-Alpha/O-III 7nm Narrow Band Dual Narrow Band Filters are specially designed for astrophotography in light-polluted environments, allowing imaging in bright artificial light pollution and moonlight conditions to capture color images without using multiple filter combinations. Images are most useful with single-use color cameras; it can be used to image emission nebulae, planetary nebulae and supernova debris; high transmittance and sharp cutting can greatly improve contrast, showing the most detailed information about deep sky objects; designed to drastically remove sodium. Artificial light interference from vapor or mercury streetlights and other unwanted interference (e.g. sky brightness); Dual-band narrowband filters are not suitable for visual observation and are not designed for imaging or observing the sun. Note that the SV220 is not suitable for fast telescopes; some users have reported that dual-band OSC filters combined with RASA can cause band changes, thereby clipping HA data. Specifications: Brand: SVBONY; Model: SV220; Name: OSC dual-band filter; Size: 1.25 inch;Substrate thickness: 1.85 mm; Clear aperture: 26 mm; Wavelength range: 300-1100 nm; FWHM: OIII (7 nm) and HA (7nm) 9. o: >OD5; Maximum Transmittance: 500.7nm@T>90%; 656.3nm@T>94%;Surface Quality: 60/40;Surface Parallelism: 1/4λ;Thread: M28.5*0.6;Single Thread: Yes;Net Weight: 7g; Package Included: 1 x SVBONY Dual Band OSC Filter of 1.25 inch and 7nm; 1 PP material plastic box.