The image is centred on a galaxy also named PGC 69457 or Huchra’s lens in 400 million light years distance in the constellation Pegasus. The galaxy is perfectly aligned in our sight-line with a distant quasar behind it. Strong gravitational lensing splits the light into 4 different cross-shaped images, discovered in 1985. The quasar's redshift of 1.7 indicates that it is located about 8 billion light years from Earth. The apparent dimensions of the entire foreground galaxy are 0.87 × 0.34 arc-minutes, while the apparent dimension of the cross in its centre accounts for only 1.6 × 1.6 arc-seconds.
Find more information on the history of gravitational lensing here: http://www.einstein-online.info/spotlights/grav_lensing_history.1.html
Find a Hubble Space Telescope image of the Einstein Cross here: https://www.spacetelescope.org/images/potw1204a/
LRGB (400-140-140-140 min) total 13.7 h, north is right, seeing 0.7-1.1 arc-sec,
80cm f/7 Astrooptik Keller cassegrain, FLI PL-16803, Astrodon gen2 filters, Prompt 7 CTIO Chile
Processing: Johannes Schedler
The high resolution within the cross could be achieved by using only a few sharpest raw images for the processing of the cross area.