Canon 50D (un-modified).
Barlow lens attached to the end of a 1.25-inch eyepiece projection adapter.
Lunt LS60THa, single etalon. 1/4s, ISO 400, B600 blocking filter.
Two frames opened in Maxim DL5, composited in Photoshop to get good tones on the disk;
composited with one of the two frames opened as grayscale in PS CS4 to extract prominence detail.

©2010, David Cortner