Abell 4 Date: Exposure: FWHM: Additional Notes: 24 September 2007 0.9 hours L (54 min.) Telescope: Mount: Camera: Filters: 18” f/3.6 Newtonian 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]