

The Abell 2151 luminance image was taken by Tony Hallas with a QSI 583ws camera using an AstroPhysics 8" APO refractor at f/8. Total exposure time was 11 hours using 33 20-minute subexposures. The image highlights the benefits of the small 5.4µm pixel in the QSI 583 when used with a shorter focal length instrument.
The color exposure time was 140 minutes each through Astrodon E-Series Gen 2 red, green and blue filters using 20-minute sub-exposures.