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amateur astronomy photo search for '20 inch Cassegrain on ADd-7 mount with fs/2' 1. voted: 4.66 / 29 votes Ring Nebula (Planetary Nebula) ( M57 NGC6720 ) 20 inch Cassegrain on ADd-7 mount with fs/2 Canon EOS 300D (digital rebel) / Minolta SRT 101 Jens Hackmann 2. voted: 2.75 / 24 votes Globular Cluster in Hercules ( M13 NGC6205 ) 20 inch Cassegrain on ADd-7 mount with fs/2 Canon EOS 300D (digital rebel) / Minolta SRT 101 Jens Hackmann © 1997 - 2010 astroscopic labs for design and web programming - photo or article is copyrighted by the photographer or author, respectively