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I am continually surprised at the quality of your images Slawomir. A 4 inch doublet is used here? Wow. It looks like the result of a much larger scope. That 3nm Ha filter and the magic of these Sony CCDs plus such a good match of the 690 sensor is working big time in your favour here.
Wonderful image.
Greg.
Last edited by gregbradley; 12-07-2015 at 02:13 PM.
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