Improve the imaging of nebulae with your RASA 8″
Astrographs by blocking light pollution
Improve image contrast and darken the sky background. This
Filter allows only the main H-alpha and H-beta OIII wavelengths
of emission nebulae and offers a high contrast. This
Filter selectively blocks the wavelengths of light from
Light sources reflecting the sky and the natural glow of the sky
pollute. Unlike similar filters with narrower ones
Bandpasses, this filter was specially designed for use with the
developed fast F/2 optics. Fits in the built
Filter mount of the 8-inch RASA and ensures optimal optical
Perfomance.