Messier 13Globular cluster in Hercules constellation.
HDR-composition used to reveal brightest center details and faint periphery simultaneously.
Two imaging series hdr-composed:14 frames by 10min. @ iso80014 frames by 2min. @ iso200
Canon 350D(mod), 180:720 Newton telescope/astrograph (self made).EQ6PRO equatorial mount. Auto-guider (75mm refractor telescope + QHY6 CCD + laptop)
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