last September i have visit this big PN. I use my Filter Switcher (OIII/H-beta) on my 21". The changes was impressive for me so i take two sketches (see below). The transparency was very good on the Wasserkuppe (mountain in Germany). With OIII Filter the PN the visible was good with a dark separation in the PN. With a H-Beta Filter the shape was change (U-Shape). Two faint segments was visible with indirect Vision. Without a Filter the PN was invisible.
Sketch, 21" (Wasserkuppe,Rhön)
Maybe you try too see this PN. I think 16" (maybe 14") is enough for OIII and very good condition.
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