| object | NGC 6888 |
| constellation | Cygnus, the swan |
| equipment | ASA Astrograph 10" at f/2,8, SBIG ST-8300M, ASA DDM85 mount |
| exposure | 9x300s H-Alpha, 6x300s OIII, 7x300s B, Baader Filters,no Autoguiding |
| date | 03.08.2011, Engelhardsberg Germany |
| conditions | stars 5m2 |
| image processing | DeepSkyStacker 3.3.2, Photoshop CS4, PixInsight 1.6 |
| remarks | extreme gradient in sharpness from top to bottom of the picture FWHM from 2" to 5", reason unknown |