Optic: Canon 400 mm f:5.6 L. Camera: Modified Baader Canon 350D (Ha pass filter - see here) at ISO800. Processing: Iris software. Exposure: 70 minutes (14 x 5 minutes). Location: Pic du Midi (altitude 2860 meters, french Pyrénées). Date: August 30.87, 2006.

Crop of the observed field

 The full frame (click on the image for enlarge)

A negative view version (the red layer only)

Click here for display a large version (3460 x 2300 pixels).