Celestron Nebula Schott B270 Glass Filter for Celestron Origin Intelligent Home ObservatoryEnjoy the most dazzling views of nebulae with your Celestron Origin when you add this H alpha H beta OIII (H H OIII) imaging filter. This specialized filter allows high throughput of light wavelengths in emission nebulae while blocking other wavelengths that could diminish image quality and detail. The result is bright, colorful nebulae images that pop with detail against the black sky background. This filters surface is 100 percent optically flat and