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Thanks Ivo, I will have a look these videos.

This will also help me in introducing your excelent software in my astro club.

Thank you very much Ivo for your answer. This is clear to me now. Your software is excelent, quite different from the other, but extremly powerfull while looking simple, it helps in geating great results in a short time. A more simple question : At the first start, the software shown a brief explain...

Here is my first image processed using StarTools : Luminance : 24x10min, with KAF8300 @ 1450mm F8. average FWHM 2.6", taken in the south of France in august 2013 (under a strong but constant wind @30mph). Chrominance : 9x10min using the QHY10 color CCD on the Astrotech 106 @ 690mm F6.5 in summer 201...