I've been trying to visualize this nebula for years, also listed as sh 2 - 155, in the scopes that have passed through time, 4",10" and now with 16". I only have memories of being able to intuit something with which my main telescope was on 10 "when I saw an extremely weak fog around the area in the stars. I can only compare the background of the sky in another part of the eyepiece and say if there is anything here !!!
A few months ago with my 16 "I only detected a little or minimal contour of that fog and a small knot of very diffuse brightness that was what really caught my attention and I can say that I have seen something.
It seems to me an object that should not be included in this catalog, apparently the entire list is visible with a 4 "refractor.
What was your experience with this object?