Orion Skyglow filter. Contrast against sky background is not as high as with UHC or O-III. More diffuse, helix lobes not as visible.
sketches : Nebulae : NGC 7293 Helix Nebula PN 11-22-2003 |
Back |
NGC 7293 Helix Nebula PN 11-22-2003 |
NGC 7293 Helix Nebula PN 11-22-2003 |
NGC 7293 Helix Nebula PN 11-22-2003 |
NGC 7293 Helix Nebula PN 11-22-2003 |
Copyright © 2003-2007 Michael Portuesi. See the front page for licensing information.