I was about to say, for a field like that captured using 15 sec subs the ISO would have to be cranked, the back ground is a little bit grainy. A 14 inch scope, at the focal length presented, this would have to be a Hyperstar image taken @ F2. Shot at a very dark site too.
Not sure about the "no flats". If it was shot using the hyperstar lens, flats would be absolutely necessary to correct massive vignetting the hyperstar would cause on the full frame sensor.
Pretty good image for essentially 50 minute of integration time.
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