The Canon EOS Ra follows in the footsteps of the company’s 20Da and 60Da: All of these cameras have a special ultraviolet-infrared (UV-IR) rejection filter that allows the transmission of ...
Alluxa, Inc., a global leader in high-performance optical coatings, filters, and thin-film deposition technologies, announces the development of two groundbreaking Hydrogen Alpha (H-alpha) Emission ...
A very intense burst of Hydrogen-alpha (H-alpha) on the limb side of of this sunspot was imaged with a Coronado 90mm SolarMax H-alpha filter and a Meade 5-inch apochromatic refractor. All images Jack ...
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