don4l Posted October 25, 2018 Share Posted October 25, 2018 Back in the summer I gathered about 30 hours of data in Cygnus with a view to producing a fantastic colour mosaic. Little did I know that photographing the inside of a sphere was not quite as simple as it looked! It all overlaps nicely, but I am really struggling with gradients, and different star sizes - which really stand out!!! Anyway, I have tried something simpler to get started. So here is my first attempt at a mosaic. STL6303, FSQ106ED at F3.6 on an EQ6. Two frames, Left 95m, right 145m. The right hand side was taken with a new Chroma Ha filter, and it doesn't have halos. Processing was done in CCDStack and Picture window Pro. Combining and alignment was done with the Gimp. Apart from the halos, I hope that the join isn't visible. Any advice welcomed. Also shown is a CdC screenshot of the area. Link to comment Share on other sites More sharing options...
MarsG76 Posted October 26, 2018 Share Posted October 26, 2018 Looks great.... well done. Link to comment Share on other sites More sharing options...
Demonperformer Posted October 26, 2018 Share Posted October 26, 2018 Very nice. And if anyone doubted the value of a chroma filter ... Link to comment Share on other sites More sharing options...
don4l Posted October 26, 2018 Author Share Posted October 26, 2018 11 hours ago, Demonperformer said: Very nice. And if anyone doubted the value of a chroma filter ... Thank you. It's a bit early to reach a proper conclusion about the filter just yet. I can already say that it is really good at not producing halos. However, to do a proper test I need to do some 10 minute exposures. My autoguiding is a bit wonky at the moment, so I am limited to 5 minute subs. Overall, there is a lot less signal, but there is even less "noise". My camera has fairly high "read noise" - so at the moment I think that my overall exposure time is the same. Focusing is taking much longer because the focus star requires 2 or three times the exposure length. When I get some longer exposures done, I will be in a position to comment properly. I also need to see how it performs at F5, as I am imaging at F3.6 at the moment. There are some reports that there is a frequency shift fast ratios. If this is true, then it will be well worth every penny. Link to comment Share on other sites More sharing options...
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