Understanding Dual Narrowband Filters
A dual narrowband filter is an astrophotography filter that allows only two specific bandpasses of light to pass through. The most common wavelengths isolated in a dual narrowband filter are h-alpha (656nm) and OIII (500.7). This type of filter is intended to be used with a color astronomy camera, or, a ‘one-shot-color’ (OSC) camera. When…