Here are a few recent filtergram sets shot with the DMK 21AU618.AS and my 4 inch solar scope system. The extended red sensitivity of the DMK 21AU618.AS certainly helps keep shutter speed up and gain down while imaging in Hydrogen-alpha, beating the less than ideal seeing conditions my central coast California location has been experiencing this year.

Jim Ferreira, Livermore CA USA, http://www.lafterhall.com/halpha_sun.html