It was interesting to see how deep I could go with 6 hours of luminance data from my suburban backyard.
Rev.B shows inverted luminance with annotations from the SDSS R9 catalog. I used the data from the Sloan G-band filter, since it covers a good part of the visible spectrum (400 - 530 nm). Additionally, objects were filtered to include only galaxies instead of stars.
The limiting magnitude of this image appears to be ~21.5, more than 1000 galaxies can be seen.
Update 17 May: I found a quasar named 7C 121446.70+472852.00 on the right side of the frame (click see full size Rev. C, the quasar is annotated in white text). It looks like a magnitude 19.5 star but it’s actually much, much further away. The redshift is 1.13 and according to the calculator below, this object lies 12 billion light years away!
http://www.astro.ucla.edu/~wright/CosmoCalc.html
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