Astrodon 3 nm H-a and OIII narrowband filters and Generation 2 RGB Tru-Balance filters.
NGC 7008, the Fetus Nebula is a planetary nebula in Cygnus located 2800 light years distant. This is a cropped image that is 12 arcmin square. The narrowband filters, in particular the OIII filter, brings out additional filamentary detail not commonly seen with RGB filters.
Description
APOD August 25, 2008 in collaboration with Dietmar Hagar
Image Date: 07/18/2008
Details: Exposure Time: 6.25 hrs Total: 3 hrs H-a, 2.5 hrs OIII, 42 min RGB
Camera: Apogee U16M
Telescope: RC Optical 16" f/8.9 Ritchey-Chretien
Mount: Software Bisque Paramount ME
Details: Exposure Time: 6.25 hrs Total: 3 hrs H-a, 2.5 hrs OIII, 42 min RGB
Camera: Apogee U16M
Telescope: RC Optical 16" f/8.9 Ritchey-Chretien
Mount: Software Bisque Paramount ME