UHC filter. Central star visible with averted vision. Not so with O-III filter. Lobed structure still quite noticeable.
sketches : Nebulae : NGC 7293 Helix Nebula PN 11-22-2003 |
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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 |
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