The original intent was to use the eBay filter pair offered by eBay seller bjomejag (Omega Optical). This pair consists of a thick filter (narrowband + blocking) and a thin "cyan" filter (narrowband Halpha but passes some blue). I had some difficulties with the thick filter. It is a wedge design and different wavelength transmission modes are separated by a relatively small angle (restricting the field of view in the scope to the same small angle - beyond which you get overlapping solar images). The filters I used here are 2 of the thin "cyan" filters - no major problems with restricted angle in the fov.
