Meade 8" f/6.3 SCT / STF8300C
Orion ED80 / LS75FHa2/B1200 / DMK41AF02
Coronado SolarMax 70 CaK / DMK 31AU03
Quote:Seems like I have read something about destructive interference from the first on the first reflective surface and constructive interference from the second reflective surface.
Part of the problem with trying to explain HA filters is you need a good understanding of light and optics; which I certainly dont have.
David W. Knisely . . . . . . "If you aren't having fun in this hobby, you aren't doing it right." Hyde Memorial Observatory http://www.hydeobservatory.info Prairie Astronomy Club http://www.prairieastronomyclub.org