The Dutch Observatory

February 5, 2013 on 8:06 pm | In Sun | Comments Off

I did experiment with my new Baader filter made from 3.8u Solar film.  This film lets much more light through than the normal 5.0u film used for observing.  This allows additional filters to be used behind the whitelight filter.  I ran a whole series of tests and put this composite together of the best images in each case.  The four images shown were made with:  90mm Orion Refractor and a Lunt wedge, a 90mm Orion Refractor with a 40mm Lunt single stacked Ha etalon, a Celestron C11 with the Baader 3.8 filter and an Orion Red RGB filter.  the final image in the group is made with the Celestron C11, the Baader 3.8 film and a green RGB filter. The single image is made with the Lunt 40mm etalon and a blocking filter on the Orion refractor.