Abell 1689 is a galaxy cluster in the constellation Virgo nearly 2.2 billion light years away. It is one of the biggest and most massive galaxy clusters known and acts as a gravitational lens, distorting the images of galaxies that lie behind it. It has the largest system of gravitational arcs ever found. (from Wikipedia)
Equipment and exposure details:
Camera: Canon 350Da (modified for astrophotography)
Mount: Takahashi EM200 Temma Jr
Telescope: Takahashi FSQ106
Aperture: f/5
ISO: 800
Shutter: 35x182 sec (total=106min)
Focal Length: 530mm
Field of View: 100%
Alignment, calibration, stacking with DeepSkyStacker , further processing with PixInsight and PS CS3
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