Decided to redo this obscure Abell with my CMOS and throw all the processing power I have at it and try Narrowband Assistant.

I used the script 1.45 and on the advice of the developer left the S-II slot open (interpreted as black).

I also put up a version with standard PI HOO pixelmath and GHS stretching with some saturation added.  The final version in the Narrowband Assistant version with GHS stretch and saturation boost.

Prior version with same Stellarvue 130 but with the CCD:


Abell 59

Gary Imm did a nice version  .  He did not see much O-III but I think I squeeked out a bit in the brighter edge area.  NB Assistant sees it (correctly) more in the Green than Blue channel. 

GENERAL NOTE ON ABELL (and other) PLANETARY NEBULA>>>>>>>>>>>>>

From Wikipedia:

The Abell Catalog of Planetary Nebulae was created in 1966 by George O. Abell and was composed of 86 entries thought to be planetary nebulae that were collected from discoveries, about half by Albert George Wilson and the rest by Abell, Robert George Harrington, and Rudolph Minkowski. All were discovered before August 1955 as part of the National Geographic Society – Palomar Observatory Sky Survey on photographic plates created with the 48-inch (1.2 m) Samuel Oschin telescope at Mount Palomar. Four were later rejected as not being planetaries: Abell 11 (reflection nebula), Abell 32 (red plate flaw), Abell 76 (ring galaxy PGC 85185), and Abell 85 (supernova remnant CTB 1 and noted as possibly such in Abell's 1966 paper). Another three were also not included in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (SEC): Abell 9, Abell 17 (red plate flaw), and Abell 64. Planetaries on the list are best viewed with a large aperture telescope (e.g. 18-inch (0.46 m)) and an OIII filter.

There is an Abell Group on Astrobin. 

This is my personal collection:

Planetary Nebula (Abell)

These are sorted by number and behind the Abell's are other miscellaneous PNs that I have imaged... I have a list of the 100 brightest.

This is Gary Imm great poster on the Abell's:

Gary's Poster

This is Jerry Macon's outstanding Abell Collection:

Jerry Macon's Abell Collection

These are some useful Abell relevant sites:

Color and IMHO Best Filter Information

Images by Season and More Filter information in German