here's the other image taken this past weekend using the Pentax 300EDIF 6x7 format lens with the PL39000M camera and FLI Research Halpha. It is 11 x 15 minutes exposure
This is reminiscent of a question mark to me....
http://www.narrowbandimaging.com/ced...km_ha_page.htm
Again I plan to add more exposure time next outing.