On the left side there are two narrowband images of the Sun I made within two hours. The upper is the Halpha line (656.3nm), the lower is the Calcium line (at 393.4nm). Coronado (www.coronadofilters.com) is offering narrowband filters and -telescopes for amateurs. The newest one is the SolarMax 70 CaK Telescope for observing the Sun in the light of ionized Calcium. I made a third, new image (the big Sun at the right) by calculating the difference of both pictures. The result is a totally new view showing Halpha details as well as CaK details in the chromosphere. It looks 3 dimensional. I hope you like that one as much as I do. Image data: Halpha: May 26, 2005, 7:32 UT, TMB 100/800 refractor, Coronado SolarMax 90, Coronado BF30, 2x barlow lens, SBIG-CCD camera STL-11000M, 1/100 second exposure time, single frame. Calcium: May 26, 2005, 9:13 UT, Coronado SolarMax 70 CaK telescope, SBIG-CCD camera STL-11000M, composit 5x 1/100 second exposure time, eyepiece projection 18mm. Stefan http://www.astromeeting.de