In the June 2003 issue of Astronomy, I outline my technique for imaging the sun using a special filter that allows only light of a particular wavelength (656.3 nanometers) to pass through. Here I will ...

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 ...

Alluxa introduces two Hydrogen Alpha (H-Alpha) Emission Line Filters that are revolutionizing the ultra-narrow optical filters market. Though these new filters have been specifically tailored to ...

This image of M13, a globular cluster in Hercules, was taken on 2005 June 25 with our SBIG ST-7 CCD camera and a near-H-alpha filter. These images of Jupiter, Io, and Europa were taken on 2004 April 5 ...