As long as I’ve been observing, I’ve always liked planetary nebulae. One the biggest reason for that is because they are some of the easiest of DSOs to see in binoculars. It wasn't until Steve Gottlieb's article in the July 2017 issue of Sky & Telescope titled "George Abell's Ethereal Bubbles" that I got hooked on trying to view Abell PNe with my 10-inch SCT. For several years I only had a 1.25" DGM NPB filter to help me but last year got a 2.0" Lumicon O-III. I have now seen 28, which is over one-third of all the true planetary nebula on Abell's list. And of those 28, I've seen all but eight of them without a filter!
If you didn't know it already, I'm interested in the "smallest aperture sighting" of most deep-sky objects. So would you all mind looking through your observing records to tell me what you've used to see an Abell PNe (with or without a nebula filter)? I am working on a project of what is the minimum it takes to see each one. If you check out this link, you'll see an Excel spreadsheet that I originally found at skyandtelescope.org listing out all the Abell PNe (I think Steve Gottlieb also created it). I've started to modify it for my purposes and included observations from several observers who have specifically sought out Abell PNe.
It will be interesting to see the results -- especially of what people have seen without a filter. But I won't lie -- Uwe Glahn and myself have seen a lot of them with telescopes no larger than 16-inches. So make sure to look at the list I've already created!
Here is a link to a PDF created by Reiner Vogul that plots all of them.
Thank you all, and I look forward to your responses! But even if you don't have anything to add, I hope you are at least inspired.