The Optolong H-beta filter is designed for nebula observation, with a 12nm bandwidth centered on a wavelength of 486nm (the frequency of Hydrogen-Beta emissions).
The filter is best suited to a large aperture telescope under clear and dark viewing conditions with good seeing.
Suitable for viewing nebulae such as the Horsehead Nebula and California Nebula.
How to read the chart?
▲The horizontal axis is the Wavelength in Nanometers (nm).
▲The vertical axis is transmission in %.
▲The WHITE line shows the transmission of the filter. Artificial light emission lines (light pollution) are shown in ORANGE and the emission lines from H-alpha, H-Beta and O-III in nebulae are shown in GREEN.