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63 | 4-Hole-Mask | Scheiner-4-Hole-Mask - for Reflector - visual observing of planets at bad seeing conditions - Scheiner-4-Loch-Blende - fuer Reflektor - visuelle Beobachtung von Planeten bei schlechtem Seeing | 150a_4-Hole-Mask.JPG |
Original Image |
Total images: 93 | © Peter Woelfle |