Ca K Barr filter : 393.38 nm - FWHM = 0.3 nm
Takahashi FSQ 106 mm Fluorite refractor stopped down to 65 mm
SBIG STL 11000M - Baader FFC
Exposure from 10 to 15 ms exposure according to sky conditions
 
 

Click on thumbnail for half-resolution image (350 ko) or on "Full-resolution image" for full-resolution image (1.2 to 2.1 Mo) or "chromospheric fringe" image