- Dual Narrow bandwidth H-Alpha/O-III 7nm narrowband filter properly designed for astrophotography both in light polluted
- Take color images without needing to combine images with multiple filters
- Useful for imaging emission nebulae, planetary nebulae and supernova remnants
- Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow
- 2 inch m48x0.75 will thread onto most 2" adapters or reducers
