Honestly, when compare with
this image of the same subject taken about a year ago, with the same camera and mount but with a simple 80/400 achro instead of an apo, one cannot help but be a bit disappointed.
True, the apo image is bigger (more binning in the achro one) and shows more nebulosity, however stars could have been better (albeit, at least at the border the problem is more due to field rotation) and, more in general, there isn't in this specific comparison the quantum leap in image quality that I would expect and that indeed I had on other subjects.
And also on this one in
mono.
Surely dealing with light gradients and field rotation was a nightmare, but the achro image was taken in basically identical circumstances.
Perhaps it was a mistake, particulary re color rendition to use ISO 1600, instead of 800 as I had done with the achro, but 80 F5 is always more luminous that 72 F6, apochromaticity notwithstanding.
As an afterthought I think I should have not done the acquisition already binned 2x2 in order to achieve 45s subs: I should have acquired 20-30 seconds subs at full resolution!
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