Sun through Coronado H-alpha filters

Updated : 10 February 2005.

• CCD : STL11000M ABG 1x1 binning
• Exposure time : 0.01 s
• Date and Time : 09. Feb. 2005
• Instrument : FSQ @ f/11.78 (SM90)
• Focal length : 1060 mm (2x Powermate)
• FWHM : about 0.07 nm (single H-alpha filters)
• Filters : Astronomik clear filter, 90mm H-alpha filter
• Image processing : MAxim V4.06 and Imageplus V2
• Problems/comments : Further processing in Photoshop. Image was done at my backyard, Mol, Belgium