NGC 4535 - Spiral Galaxy

(click image for full resolution)

Distance: 54 million light years
Telescope: 24-inch RCOS
Camera: SBIG STL11000

Custom Scientific Filters
Exposures: 2 Hours 45 minutes unfiltered + 30:20:30 in R:G:B filters
Total Exposure Time: 4 Hours 5 minutes

Adam Block / Mount Lemmon Sky Center / University of Arizona