Well, Martin Pugh has done what I consider to be the best narrow field Centaurus A image in the World using a scope under 20". Martin used a 12.5" RCOS at 2850mm FL with a KAI11002 chip and AOL (adaptive optics) riding on a PME. LRGB image - exposure time over 6 hours.
Here I have compared Martins superb image directly to my cropped RGB image taken at just 1140mm FL with a 6" scope and then croped out of the much wider field of view. RGB image only - exposure time 4.5 hours
Not sure what Martins processing included but I certainly used no deconvolution on my image. It is clear that Martins image is superior but the difference isn't "that" great really...?
http://www.pbase.com/strongmanmike20...45498/original
To have the luxury of also being able to get the following full fame image from the same data set with the 1140mm FL scope means a wide FOV with adequate focal length is the way to go to maximise imaging versatility without the need for multiple outfits/equipment
http://www.pbase.com/strongmanmike20...61387/original
Just my thoughts of course
and Martin if you are reading this I hope you are ok with the comparison - your image is better in this particular comparison for sure, I am just trying to make a case to answer the age old quest for "what is the perfect imaging scope"
Mike