M 57 Date: Exposure: FWHM: Additional Notes: May - August 2008 22 hours LHaRGB (146:990:58:46:54 min.) 2.1 arcsec APOD 18 September 2008 Telescope: Mount: Camera: Filters: 18” f/5.3 Newtonian+10.5” Cassegrain f/11 Heavy German Mount SBIG ST10-XME Astronomik Typ II.c LRGB The content of the entire website is subject to German copyright law. Copyright 2012 Astro-Kooperation All rights reserved. [click photo to enlarge]