Most are just 15-60 second exposures set at 6,400 ISO. In April 2019, we installed a special camera drive to rotate with the stars and allow longer exposures at a lower ISO for better resolution.
milky way galaxy
Astronomy Roadshow Observatory Project in Apache County, Arizona, USA
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4.30am; 8 April 2019 90 second exposure
Aug 2019; 40 second exposure