Additional Info on the ASI2600 and Small Filters

With the cloudy skies, or clear skies with a near full moon and/or other activities keeping me real busy (Easter choral group rehearsals as choral director at Crosslife Bible Church) I haven't been able to continue with my testing of the new ASI2600mm, and I'm still waiting for a new OAG to arrive so that I can mount it on my EdgeHD-11.

As I mentioned in my previous blog, I was worried that the 31mm filters would cause serious vignetting on my subs. My first experiment showed that cropping the subs about 10-15% yielded very good results. However, it turns out that with good flats I was able to use the entire sensor and achieve rather excellent results. Here is a simple post-processed image of the Seagull Nebula in Ha.

Seagull Nebula - 4x300sec Ha
GT102 f/5.5

This is very promising. Of course, more testing is needed with all the various filter types, LRGB and the full NB set. And, I still need to test on the Edge.