My somewhat cryptic notes from 2006, with a 12.5" f/5.75 scope in skies of magnitude 21.6:
"roundish-oval,v.brite,edge very diffuse & faint,brite ctr ,inner bluish,outer reddish!,can use >300x, hi surf.briteness,cent.* vis"
My notes show the central star is magnitude 12.5, which should be easy in most scopes.
I didn't see the extensions that represent the turtle's legs (obviously for a big scope!).
I did see colors, as Steve reported. I have noted, of late, that my red sensitivity, by comparison, is higher than many observers.
My notes also indicate that no filter was used for the observation.