Revisited to check the OIII filter on M27. It works wonderfully well on this object! The football shape elongated nebula surrounding the central 'apple core' is very visible with the OIII and the central apple core shows more detail with the OIII. Overall this object looks better with the OIII over the Ultrablock. M27 is another good outreach object, and with the OIII it is a great view even for first-timer observers.